Tuesday, September 27, 2022

The "bugs" that ruled the Paleozoic

 kw: book reviews, nonfiction, science, geology, paleontology, trilobites, paleozoic era

If there were no dinosaurs, everybody's favorite fossil animals would be trilobites. Soooo, they are second-favorite. They are not big like dinos. Most are between an inch and 4 inches long (25-100 mm).

What they lack in size, they make up for in panache! They had eyes (most of them), lots of legs, and a distinctive, unique look.

Though they vaguely resemble familiar animals such as horseshoe crabs and pillbugs (roly polys or woodlice), the last trilobites became extinct 251 million years ago. They have no modern descendants.

The three "lobes" of their designation are not arranged front-to-back, as many assume, but side to side. The central lobe is flanked by a right and left lobe consisting, in front, of cheek plates, and behind, of shell plates that covered the legs. A tail-end called a pygidium may be no more than a tiny blob, or may be as large as the head (called a cephalon).

Literally the most common trilobite is named Elrathia kingii. These attractive "bugs" are found in rocks  of middle Cambrian age, 515-499 million years old. Most specimens are found in Utah, with shells consisting of very dark gray calcite on a lighter gray matrix. They are rather small, usually an inch (25 mm) or less, but range up to 1.6 inches (39mm).

This is enough to whet the appetite a little. The range of species is immense: 25,000 named trilobite species so far, ranging from the early Cambrian, 521 million years ago, to the end of the Permian 251 million years ago, when they and many other marine animals were wiped out in the Great Dying that killed 99% of everything.

Several hundred species are pictured in Travels with Trilobites: Adventures in the Paleozoic by Andy Secher. Mr. Secher is one of the premier collectors of trilobites, having more than 4,000 specimens. Many of the photos in the book are of specimens in his collection. He is affiliated with the American Museum of Natural History as a Field Associate.

The book is arranged first by time. Trilobites are such a characteristic marker of Paleozoic rocks that it made sense to set chapter by chapter in the periods of the Paleozoic era. Four Chapters cover the Cambrian, Ordovician, Silurian and Devonian periods. A single chapter covers the rest, the Carboniferous and Permian periods, as they are known worldwide except North America, where the Carboniferous is divided into Pennsylvanian and Mississippian periods. The reason for this grouping is that trilobites were becoming less common, and many orders and families had gone extinct by the beginning of the Carboniferous period.

Within each chapter we find extended treatments of classic and prolific collecting localities. Naturally, the unequalled Burgess Shale, of middle Cambrian age, around 508 million years ago, is discussed in loving detail in the Cambrian chapter. Interspersed among the locality descriptions we find topical subjects such as "Trilobite Soft Tissue Preservation" (The Burgess Shale was the first major locality of this kind, preserving much more than trilobites) and "Trilobite Enrollment" (they could roll up like pillbugs or armadillos). Each chapter ends with several "Rapid Reports" of localities not discussed in detail, and a photo gallery of specimens from the chapter's geological period. The page below is from the Ordovician chapter.

These photos illustrate some of the variety of preservation styles. While these are among the best specimens in existence of their respective species, they show how some trilobites are more flattened, and some have been preserved in the round.

If you go to any locality where trilobites are common, will you find specimens this beautiful? It's rare. Mostly what we find are portions of the shell. For every trilobite that died intact and was preserved whole, there are thousands or millions of shell parts from molting. Their shells had sutures, as do the shells of crabs; periodically the animal would pop off the shell in parts, and, as rapidly as possible, grow a larger one. They were very vulnerable in the "soft shell" condition…as are soft shell crabs!

When a complete trilobite is found, it is seldom all visible. The first illustration above, for example, shows how a preparator had to remove surrounding material to expose the animals. The one in the upper middle, for example, was at a different depth (I don't know how the preparator knew that), so a lot of matrix had to be removed to reveal it.

Preparators are the behind-the-scenes heroes of the trilobite trade. They may start with a nodule that shows nothing more than a couple of tiny spots of shell, and spend hours removing material until the whole is exposed…or not. Many times the result is not what was expected. But they soldier on. A specimen such as this one requires a lot more work than the flatter ones most of us are accustomed to. This is a Walliserops, found in Morocco, where in recent years many incredible 3-D specimens of many species have been unearthed.

The last chapter of the book touches on many topics, including preparation. One side matter is "Fake Trilobites". Some preparators are more sculptors than extractors. If you want to buy some of the more common trilobites, you have little to worry about. But with others that are more rare, well, watch out. Get help from an expert!

Rather than go on and on, let it suffice that this almost-coffee-table-size book is well worth reading, well worth looking over again and again, and a terrific introduction to these fascinating Paleozoic "bugs".




Thursday, September 22, 2022

Counterblow in Earth?

 kw: physical phenomena, seismic focusing, extinctions, asteroid impacts, flood volcanism, siberian traps, deccan traps

A YouTube video from Demolition Ranch features a large glass sphere, eight or nine inches in diameter, which was shot at with various guns. A very interesting phenomenon occurred with each shot, from 9mm and larger.

Near the left side of the sphere is the damage at the impact site from a .44 Magnum round. The damage covers about 1/4 of the surface of the ball, and conchoidal fractures are seen inside the ball all around it. The damaged area right of center is from an earlier shot with a smaller caliber round.

The amazing phenomenon appears when the sphere is turned around…

At lower left, there is a zone of damage, a shattered area surrounded by conchoidal fractures. Through the sphere you can see, at upper right, the larger damaged area around the impact. Two other bullets of lesser caliber also caused damage on the side of the sphere opposite their own impact points.

What has happened here? Some very interesting physics!

The concussion wave from the bullet impact was focused by the ball on the area opposite the impact, where it was powerful enough to do significant damage. This has implications for events in Earth's history that I have thought about over several decades.

As a geology student in the early 1970's I learned of the "large igneous provinces", characterized by enormous quantities of flood basalt. Two in particular stand out: the Siberian Traps and the Deccan Traps. In geology, a "trap" is a stepped area underlain by a large sheet of igneous rock such as a flood basalt. The word "trap" comes from a Swedish word for "staircase".

These two igneous provinces have ages that coincide with two of the great extinction events. The Siberian Traps were emplaced about 251 million years ago, and are considered the primary cause of the great end-Permian extinction event, when 90% of all species were exterminated, and about 99% of all animals and plants were killed. 

The Deccan Traps of western India were emplaced about 65 million years ago, and have been proposed as either a primary cause or a strong contributing factor to the great end-Cretaceous extinction event, when 75% of all species were exterminated, and about 90% of all animals and plants were killed, including nearly all the dinosaurs (the surviving, smaller dinosaurs later became birds). This article in Science Direct, from 1999, reports on the age of the Deccan Traps: 65.6±0.3 million years.

You probably know that an asteroid some 10 km in diameter is known to have struck near what is Yucatan today, 65 million years ago, and is now considered the primary cause of the "Doom to Dinosaurs" extinction.

Is it just a coincidence that enormous volcanic eruptions in India began just then? I think not. Paleogeography is not yet as exact as I would like. Continental motions are known in general terms, but not with great accuracy. As well as I can determine, though, Yucatan and India were antipodal to one another 65 million years ago. I think it is likely that the impact triggered the volcanism, by the same focusing mechanism that the glass sphere experienced. The amount of lava that erupted is hard to conceive: about a million cubic km, covering an area of half a million square km to a depth of 2 km. The volcanism went on for about 30,000 years (that word "about" is very iffy!).

Thus, as bad as the "nuclear winter" caused by the asteroid impact would have been, the volcanism made things a great deal worse. Without the Trap basalt eruptions, the extinction event might have been much less severe.

Now, consider the Siberian Traps. The volume of erupted material is 4 million cubic km, and covers an area of 7 million square km. That's whole lot bigger and badder. All by itself, this is considered quite sufficient to have caused the end-Permian extinction.

Could the Siberian Trap volcanism also have been triggered by an antipodal asteroid strike? The arrangement of continents 251 million years ago is even less precisely known, compared to 65 million years ago. I looked at reconstructions of Pangea at about that time. It appears that the point antipodal to the middle of the Siberian Traps was in the ocean, 1,000-2,000 km off Antarctica (which was 30 degrees north of the South Pole at that time).

Had the antipode of north-central Siberia been on a continent, it would be worthwhile to look for a long-buried crater some 400 km in diameter (or larger). However, the ocean floor is consumed at a steady rate by plate tectonics. There is hardly any ocean floor now existing that is older than 200 million years, and that is an edge of the Pacific plate west of Alaska. There is little to no likelihood that a crater remnant from an asteroid, that could have triggered the Siberian Trap volcanism, will ever be found.

While I think it likely that an asteroid triggered the Siberian flood volcanism, I can't prove it. But the experiments with the glass sphere are certainly suggestive!

Friday, September 16, 2022

Discovering Neolithic political diversity

kw: book reviews, nonfiction, archaeology, anthropology, political science, history

I considered various titles for this review. One strong contender was "Is totalitarianism inevitable?" But that is too narrowly focused. The scope of The Dawn of Everything: A New History of Humanity, by David Graeber and David Wengrow, is nothing less than all of human history at least since the later part of the last Ice Age, 12-15,000 years ago.

To focus the authors' intent a bit: starting with the question, "What is the origin of inequality?", they explore the history of political thought and practice, and almost immediately reveal that the question is meaningless [indeed, it is a red herring intended to obscure the machinations of totalitarian thinkers - my sentiment]. Furthermore, they examine the framework of historical thinking that forms the basis of nearly all writing on historical development—egalitarian bands of nomadic foragers developed into agriculturalists, which began to settle into villages and cities and store grain, which necessitated concepts such as property rights and the need for hierarchical and bureaucratic structures to manage it all, culminating in kings and empires and other forms of coercive government—and they conclude that it is based on circular thinking. Generations of historians have primarily been gathering "evidence" to support the linear hypothesis, while wantonly disregarding and discarding a great mass of actual evidence that paints a very different picture; more properly, a multitude of pictures, of which the "modern" environment of nation-states that we find nearly worldwide is a recent development, even a recent aberration.

Consider the Cahokia Mounds, remnants of a large, settled area that was built up over a period of a few hundred years, primarily between about 900 and 1200 AD. This painting shows how it may have looked at its peak. The gigantic Monks Mound is near top center. The whole area was abandoned and depopulated by about 1350. Although there is evidence of two flooding episodes, in about 1200 and after 1350, it is unlikely that environmental factors led to its decline (in contrast to the environmental disaster that precipitated the decline of the Maya prior to 1000 AD).

At the time Europeans first arrived in the area in the 17th Century, a small number of indigenous Americans lived nearby, but avoided the area, designating it with words meaning "Death". Some think there had been an epidemic, but no archaeological evidence points to this. Others, including the authors of Dawn, consider it likely that a coercive political structure arose and became so overweening that, over a generation or two, everyone moved elsewhere. It is likely that the remaining "overlords", faced with declining numbers of "subjects", turned inward and effectively destroyed themselves, until the last few left, probably to find themselves considered pariahs by anyone they encountered.

The authors begin by examining two contrasting views of the human "state of nature", that of Rousseau and that of Hobbes. The first is based on the premise that people are naturally good and that equality is the natural state in which "early humans" lived in foraging bands like the Hadza of Tanzania, seen here. Such peoples have few possessions, and rather than elevating "mighty hunters", make fun of them.

The Hobbesian view is dystopian, based on the premise that people are naturally selfish and cruel. He it is who wrote in Leviathan that human life was "solitary, poor, nasty, brutish, and short." In fact, you can find Hobbesian societies even today: a few areas in which, if two men meet in the forest, they first stand back and discuss whether they have any common relatives or friends, to determine whether they should fight to the death, or collaborate. They are a lot like chimpanzees in that regard. There are others, and these are more common, where the two men would greet one another in a more friendly way, and discuss whether their two "tribes" have goods or skills worth trading. Such peoples are satisfyingly Rousseauian. One might compare them to bonobos, who "make love not war."

Gathering all the evidence they can, particularly in writings most authors skip over or fail to cite, the authors find a wealth of diversity in the social and political structures that have arisen over time. In areas with a definite sequence of seasons, such as North America, many peoples had a dual system: Part of the year, they would live in villages or towns—sometimes temporary like "tepee cities" and sometimes more permanent but occupied only part time—and part of the year they would be nomadic, following game animals. The political structure would evolve with the seasons. Some, in certain seasons had chiefs and temporary "police" to enforce their orders, but in the opposite season the whole structure would be disbanded. More usually, any "chiefs" were primarily skilled negotiators with no power.

Indeed, Europeans who studied the cultures they encountered in North America in the 1500's and later learned that tribal councils and other groups, frequently including both men and women, discussed politics a lot, and were quite capable of modifying political structures to suit not just the season but changing times…such as the incursion of "palefaces" who didn't recognize their rights and sovereignty. The authors make a case that indigenous Americans' political opinions, first during discussions and debates with early French and Spanish explorers, and later in Europe when some visited there, influenced Enlightenment thinkers as they developed the political theories that underlay both the French and American Revolutions. It is likely that some provisions in Bill of Rights (Amendments 1-10 of the U.S. Constitution) were in part based on rights the earlier Americans considered normal. By the time the Constitution was written, political discussions among the "civilized tribes" and European immigrants had been going on for almost 200 years.

Nation-states are, in historical terms, a recent innovation. Spain was unified early, in 1512. Latecomers such as Italy were formed in the middle 1800's. Empires unified before about 1000 AD fell, rose, and reformed from time to time, with final unification occurring in the same period (think of Greece).

Fun fact: During the 1600's and later, numerous indigenous Americans visited Europe. None of them wanted to return to Europe, and they abhorred the idea of living there permanently. During the same period, some Europeans lived for various periods of time among the tribes of North America, and later returned to the Euro-American societies they had lived in before. Many of them subsequently returned to "live with the Indians".

Another cultural trend is ferreted out from various areas, and the authors focus on the northwest coast of North America, from modern northern California to British Columbia. They describe two (very) contrasting cultures, the Kwakiutl and the Yurok, as exemplars of schismogenesis, in which peoples (such as Houstonites and New Yorkers) define themselves against one another. "One man's meat is another man's poison," in a proverb from my childhood. One tribe held slaves; the other did not and eschewed the practice. Members of one tribe were boastful; of the the other, self-effacing. Compared to these two tribes, the differences between Texans and New Yorkers practically vanish.

Though many examples from North America are used, in great part because of near-contemporary accounts written during the European influx, the authors bring together similar evidence from Mesopotamia, China, South America, and Africa. Through most of human history in all these areas, the concepts of "equality" and "inequality" were meaningless, and there are no words for them in most old languages, at least, not used is a social or political sense. [In Greek we find the word ισότης (isotés), which is used for "equality" in modern texts, but really means "parity" or "evenness", and is a more technical term]. A very common situation is found to be that "cities" were used only part of the year, in many, many places. This went on for millennia.

The real question then becomes, "How did the current situation arise?", even, "Why did humanity go down such a narrow social and political path?" In Chapter 2 the authors write,

"There is no doubt that something has gone terribly wrong with the world. A very small percentage of its population do control the fates of almost everyone else, and they are doing it in an increasingly disastrous fashion." (p 46)

And in Chapter 3:

"If human beings, through most of our history, have moved back and forth fluidly between different social arrangements, assembling and dismantling hierarchies on a regular basis, maybe the real question should be ‘how did we get stuck?’ How did we end up in one single mode?" (p 65)

All this serves to do no more than introduce the subject. The authors define a "civilization" as an "extended moral community". Kings, bureaucrats and armies are optional. Agriculture is even optional. Great amounts of evidence demonstrate this conclusively.

Consider this: it has been shown by experiment that wheat grass can be turned into wheat in a few decades, primarily by fostering mutations that permit the grain to remain attached to the stem after ripening. Yet the "grain revolution" in Mesopotamia, for example, was more of a mosey than a sprint, taking 3,000 years between the first purposeful use of wheat grass and the widespread cultivation of wheat as a crop that required a farmer's care.

The authors report that, in place after place, agricultural methods were used for a time, and then abandoned, only to be started anew after a few generations, and then abandoned again, and so forth. We find strong indications that the liberty of individuals and groups was found to conflict with settled society. Equality is not the point. In Chapter 12, in page 264, they contrast the French "republican" ideal, "Liberty, Equality, Fraternity", with the concept of social liberty, consisting of "(1) the freedom to move away or relocate from one's surroundings, (2) the freedom to ignore or disobey commands issued by others, and (3) the freedom to shape entirely new social realities, or shift back and forth between different ones."

When I was a child, my parents once praised American freedom, and contrasted it with Russian Communism, thus: "We don't need to carry papers. We can move from California to Utah without getting government permission. We can change jobs at will. We can even leave the country for any period of time we desire, and return whenever we want." I remember when the Berlin Wall was built. I also remember when it fell, on my birthday in 1989 (I wept joyfully for a long time at the news). Freedom of Location.

We find in the Bible the apostles telling the priests, "We are bound to obey God rather than men." Though they submitted to political sanctions such as imprisonment, they not only didn't agree to obey, they announced they would never obey improper laws. That is the basis of martyrdom. It is also the basis of Freedom of Conscience. You don't need a religious reason to disobey unjust laws.

The Declaration of Independence declares in its second paragraph, 

"That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness."

The idea that governments "derive their just powers from the consent of the governed" could have been based on things spoken by indigenous American statesmen a century earlier! Pay attention to that word "just". Most governments now on Earth, being authoritarian or totalitarian, are unjust. Thus, Chapter 10 is revolutionary. It is titled, "Why the State Has No Origin: The humble beginnings of sovereignty, bureaucracy and politics". Quite simply, it snuck in over generations. 

What has actually happened? The authors make passing reference to Jared Diamond's book Guns, Germs, and Steel. What follows is my very brief synthesis of the messages of the two books.

The bow and arrow go back as far as 70,000 years. Powerful composite bows came later, perhaps 3,000 to 4,000 years ago. The sling is at least 12,000 years old. In bronze age armies employing both archers and slingers, the slingers had greater range than the archers, with similar accuracy at distances up to a quarter mile; not terribly accurate at that distance, but 100 slingers or archers can produce a fusillade that keeps an opposing body of infantry at bay. But neither bow nor sling can be said to be a good sniper's weapon. A single archer or slinger is unlikely to achieve a clean kill, whether of man or deer, at distances exceeding 50 yards. Thus, for most of human history, coercion was limited to such distances. Freedom of Location, also known as self-exile in a political context, could be exercised rapidly enough to escape the enforcement of any ambitious "ruler" who presumed to give unpopular orders. The legends of Robin Hood and similar "outlaw" bands also show that weapon use can go both ways. Weapon parity supports Freedom to Say No.

Late Medieval and Enlightenment-era palace intrigue, which relied on spies, and the funds to pay (bribe) them, could extend the power of coercion over greater distances, albeit slowly. It took the invention of firearms, and later longer-range weapons such as missiles, plus instantaneous communications, to bring about the actual ability to control country-sized areas with any reliability. A sniper with a modern rifle can kill from half a mile away, provided there isn't much wind (the record is just over 2 miles!). Nobody can outrun the radio or telephone. Large, non-personal weapons can reach anywhere on Earth.

A second "weapon" in the arsenal of the modern state is surveillance. Prior to the development of cheap video equipment, this also relied on spies and informers. Not so much any more. My cell phone has five video cameras in it, each tuned to a different use. The NSA (plus legions of hackers) is able to use the phone's audio and video functions to spy on me and on my surroundings. Of course I have some amount of phone security, but I am not naïve; NSA can get in if they want. Not only so, cell tower equipment now typically records every "ping" from a nearby phone. Police in every country (including the U.S.) routinely obtain these records to trace the movements of "persons of interest"…or anyone else they so desire. Fourth Amendment be damned [If you need to move about un-tracked, of course turn off your phone, but also put it in a bag made from an aluminized Mylar balloon. The day will come when "going off grid" that way will be considered a suspicious act in itself].

These points emphasize my opinion that governments always tend towards becoming totalitarian. At some point, it could become infeasible for "citizens" (all will be "subjects") to overcome universal surveillance and universal coercion. For a little while, some may be able to mitigate electronic surveillance by the use of frequency-scanning equipment and a device called a HERF (look it up - it burns out drones or cameras, etc., from a distance).

Authors Graeber (now deceased) and Wengrow aren't going after governments. Rather, they are tweaking the noses of anthropologists and archaeologists who have, almost unanimously, fallen prey to the linear hypothesis of social progress. Social evolution, similarly to biological evolution, is a frequently-branching tree, with many branches being pruned away even as more arise. Somehow, the bushy tree of human civilizations and social experiments has been schwacked to a single twig, that has grown monstrous and world-spanning.

Perhaps if we can, on a much broader scale, understand the varieties of social and political developments of the past, we can with a clearer eye examine today's social and political institutions, and, if we are lucky, should we find them wanting, we could resurrect (no dinosaur DNA needed!) appropriate institutions, or develop entirely new ones, that better serve the present human population.

Tuesday, September 13, 2022

The first drop in the asteroid-moving bucket

 kw: science, orbital mechanics, asteroids, near-earth asteroids, dart mission

Didymos is a small asteroid, about 3/4 km in diameter, or less than half a mile. Not quite mountain-sized, more like a big hill. It has a satellite, named Dimorphos, 170m in diameter, the size of a five-story office building. Unlike an office building, which is 90+% air, it is a big rock. It weighs about five million tons.

This orbiting pair have the great good fortune to be in an orbit that is "reachable" by spacecraft. Not quite Earth-crossing, but much closer than most. As an orbiting pair, these rocks are also much easier to study dynamically. In particular, the orbit of Dimorphos about its common center of gravity with Didymos can be well-characterized, and very small changes in its orbit can be detected. Changes such as the one that will soon occur.

In a couple of weeks, a NASA spacecraft will be smashed into Dimorphos at high speed, and the collision will be watched by a companion spacecraft (the little one shown at center left in this NASA publicity image); and also from ground-based telescopes, symbolized by the icons at lower left.

How sensitive a "probe" is this little satellite? The key is its orbital velocity and period, which can be measured with great precision.

The collision, on September 26, 2022, will be made on the leading side, so it will slow Dimorphos down a tiny bit, moving it into an orbit just a bit closer to Didymos. The key parameters are these:

  • Mass of Dimorphos: 4.8 billion kg, equal to 4.8 million metric tons or 5.3 million short tons.
  • Mass of the DART impactor: about 500 kg on impact. It starts out weighing 610 kg, and burns propellant to ramp up to speed.
  • Impact relative velocity: 6.6 km/sec, equal to 4.1 mi/sec or almost 15,000 mph. For comparison, the orbital velocity of Earth around the Sun is about 67,000 mph or 29.9 km/sec.

The minimum change in the velocity of Dimorphos is calculated by assuming a perfectly inelastic collision. It comes to 0.6875 mm/sec. 

NASA writes that they expect an orbital velocity change of 0.4 mm/sec; perhaps they are assuming lots of kinetic energy will be lost to vaporizing the DART impactor and about a desk-sized chunk of Dimorphos. NASA expects this small slowing of the moonlet to move it into a slightly smaller orbit, such that it will speed up a bit and each orbit will take about 10 minutes less than before. The orbital period is presently just under 12 hours.

It occurs to me that NASA's figure of 0.4 mm/sec must represent the expected increase in orbital velocity resulting from the shrinking of the orbit. Perhaps the instantaneous "bump" will be of the order of 0.7 mm/sec of slowing, but in the resulting, smaller orbit, Dimorphos will have an average velocity as NASA has calculated (their math whizzes are certainly much more savvy than I!).

That's as far as my amateurish figurations can take me. I'll stay tuned to the NASA webcast on the 26th! This is step 1 in figuring out what it takes to shift the orbit of any asteroid that is found to be threatening Earth.

Friday, September 09, 2022

Monkeypox and STDs - it isn't just sex, it's promiscuity

 kw: medicine, medical musings, disease, monkeypox, std's, sti's

At one time diseases such as syphilis and gonorrhea were called Venereal Diseases, or VD's. "Venereal" refers to Venus, the Roman goddess of "love", actually, "lust." A generation or two later the preferred term vacillated between Sexually Transmitted Diseases (STD's) and Sexually Transmitted Infections (STI's). These days the political correctness police don't know quite what to call these "social diseases." Also, in the past generation more diseases have attained this status, including Chlamydia, venereal warts, genital herpes, and, of course, HIV/AIDS.

The most recent disease to be tentatively added to the list is Monkeypox. It has mainly afflicted those in central Africa, particularly Nigeria. In those areas, it afflicts people of all ages, including children, and while more men than women are afflicted, the difference is not huge. In the rest of the world, now that it is spreading everywhere, the picture is different. Particularly in the West, most victims, 90% or more, are gay men. Thus there is a huge outcry in some quarters against those who would call Monkeypox a STD or STI, calling them "homophobic". What is Monkeypox, really?

The virus that causes Monkeypox is related to the Smallpox virus. Smallpox was very transmissible, but usually required contact. However, even the briefest contact, such as brushing by someone in a crowd, was often sufficient. Monkeypox is apparently not nearly that transmissible.

There used to be fears that one could catch syphilis from a solid handshake. That turns out to be slightly true, but only if both persons have very sweaty hands, and the person originally infected has been touching disease lesions (they do itch). It is actually quite hard to catch syphilis. It is easier to catch Monkeypox.

Let's step back a moment to consider a point nearly always missed: EVERY infectious disease can be transmitted by sexual contact. The small list of "STD" infections consists of those diseases that are so hard to catch, sex is required for transmission. 

Is Monkeypox such an infection? It is probably almost that hard to catch. It may inhabit a borderland, a near-STD-but-not-quite. That is, while it's safe to say that anyone who has syphilis caught is sexually, there are apparently a small percentage of cases of Monkeypox that were caught by less intimate contact. But the number is small.

The fact remains that in Western countries, more than 90% of those who have caught Monkeypox are gay men. The very few women who have caught it all seem to have a bisexual boyfriend.

What is it about gay men that has made them so susceptible? I point out the "Gay culture", characterized in the 1980's by the "San Francisco bathhouse" phenomenon, where a designated "receiver" (I don't know the real term, and I don't care what it is) would be sodomized by 30-60 men, one after another. One can imagine that any diseases found in that crowd would spread and spread and spread, week after week. Such practices fueled the early spread of AIDS. That culture may have died down somewhat since, but it is not extinct, and it is fueling the spread of Monkeypox.

The heterosexual spread of AIDS in Africa in the 1980's was fueled by both men and women having numerous partners, just not as intensely as in the bathhouses. Monkeypox in Africa is following a similar course.

The obvious conclusion is that we need a new term. Monkeypox and the other "social diseases" that came before are actually diseases of promiscuity. Someone who has either zero or one sexual partner for one's whole life will never catch any of such diseases (Rape counts as adding one more sexual partner, however unwilling the victim).

I tentatively propose the term Promiscuity Diseases, PD's, to give the medical establishment and society in general time to mull over what we have here, and possibly coin a better term.