The Earliest Modern Humans

 The most current scientific understanding of the earliest modern humans—Homo sapiens—points to a complex, pan-African origin rather than a single birthplace or moment in time.

• ~800,000 years ago: Genetic divergence from Neanderthals and Denisovans begins.

• ~315,000 years ago: Jebel Irhoud, Morocco — earliest known Homo sapiens fossils.

• ~260,000 years ago: Florisbad, South Africa — partial skull with modern traits.

• ~233,000 years ago: Omo Kibish, Ethiopia — anatomically modern human remains.

• ~160,000 years ago: Herto Bouri, Ethiopia — Homo sapiens idaltu, an early form of modern humans.

This timeline reflects the current consensus that modern humans evolved gradually across Africa, with multiple populations contributing to our genetic and anatomical heritage. Let me know if you'd like a map version showing the fossil sites or a chart comparing traits across these specimens.

The oldest known Homo sapiens fossils come from Jebel Irhoud, Morocco, dated to about 315,000 years ago. These remains show a mix of modern facial features and archaic braincase shapes, suggesting a gradual evolution.

Other Early Sites:

Omo Kibish, Ethiopia: Fossils dated to around 233,000 years ago, with features typical of modern humans.

Florisbad, South Africa: A skull dated to ~260,000 years ago, showing a blend of archaic and modern traits.

Herto, Ethiopia: The Herto Bouri skull (~160,000 years ago) is classified as Homo sapiens idaltu, an early form of anatomically modern humans.

Genetic Evidence: DNA studies suggest that the lineage leading to Homo sapiens diverged from Neanderthals and Denisovans between 500,000 and 800,000 years ago, with genetic mixing occurring both within Africa and later in Eurasia.

Pan-African Evolution: Rather than emerging from one region, Homo sapiens likely evolved across multiple African populations that intermittently mixed due to climate-driven migrations. This mosaic evolution helped shape our species’ genetic diversity

Imposing Order on the World

The Frans Hogenberg portrait (1574) shows him pointing at the North magnetic pole.

This is not a leap year with 366 days and a February 29 is a reminder of the ways we (try to) impose order on the world. Some of those ways seem to work pretty well - atomic clocks, GPS, compasses, maps, and globes. One person who tried to impose some order on our world who we can learn about in the One-Page Schoolhouse today, is Gerardus Mercator. If you need a one-word description of him, it would be "mapmaker," but that is rather limiting. You could add cartographer, geographer, calligrapher, engraver, a maker of scientific instruments, and a publisher. He was interested in mathematics, astronomy, cosmography, terrestrial magnetism, history, philosophy, and theology.

Gerardus Mercator (5 March 1512 – 2 December 1594) was from the County of Flanders. He is most renowned for creating his 1569 world map based on a new projection. Mercator was one of the pioneers of cartography and, in his time, was known as a maker of globes and scientific instruments.

Mercator's early maps were in large formats suitable for wall mounting, but in the second half of his life, he produced over 100 new regional maps in a smaller format suitable for binding into his Atlas of 1595. This was the first appearance of the word Atlas in reference to a book of maps. However, Mercator used it as a neologism for a treatise (Cosmologia) on the creation, history, and description of the universe, not simply a collection of maps. He chose the word as a commemoration of the Titan Atlas, "King of Mauretania", whom he considered to be the first great geographer.

This world map was made by Mercator on two sheets in 1538. Only two copies of the map are extant.
This one is from the American Geographical Society Library; another is at the New York Public Library. 

In 1538, he produced his first map of the world, usually referred to as Orbis Imago. But it is his 1569 world map for which he is still remembered. You may have heard of the Mercator Projection, especially if you are a sailor. This cylindrical map projection became the standard map projection for navigation because of its unique property of representing any course of constant bearing as a straight segment.

Such a course is known as a rhumb or, mathematically, a loxodrome. Using it navigators can sail in a constant compass direction to reach its destination, eliminating difficult and error-prone course corrections.

But, as with many manmade ways of imposing order on our world, his constant linear scale in every direction has side effects. The Mercator projection inflates the size of objects away from the equator, starting almost imperceptibly but accelerating with latitude to become infinite at the poles. That means that while landmasses near the equator appear accurate,  landmasses at the poles, such as Greenland and Antarctica, appear far larger than their actual size.

The Mercator world map of 1569 is titled Nova et Aucta Orbis Terrae Descriptio ad Usum Navigantium Emendate Accommodata. That is Renaissance Latin for "New and more complete representation of the terrestrial globe properly adapted for use in navigation."

While the map's geography has been superseded by modern knowledge, its projection proved to be one of the most significant advances in the history of cartography.

Mercator's 1569 world map showing latitudes 66°S to 80°N.

The Collaborative Study of Early Modern Humans

Because the story of early modern humans is not just about bones—it’s about biology, culture, climate, technology, and movement across continents. Each discipline fills in a different part of the mosaic. Research into the origins of Homo sapiens is deeply interdisciplinary. No single type of scientist can answer the whole story, so the field relies on a network of specialists who each illuminate a different piece of the puzzle. 

Paleoanthropologists are the primary scientists who study ancient human fossils—skulls, bones, teeth—and interpret how our anatomy evolved. They analyze sites like Jebel Irhoud, Omo Kibish, and Florisbad to determine what early Homo sapiens looked like and how they changed over time.

Archaeologists study the tools, shelters, art, and other cultural artifacts left behind. Their work helps reconstruct how early humans lived, migrated, and interacted with their environments. 

Geneticists (especially evolutionary geneticists) analyze ancient DNA (when available) and modern human genomes to trace lineages, migration patterns, and interbreeding events with Neanderthals and Denisovans. Their work is crucial for understanding divergence timelines (e.g., 500,000–800,000 years ago). 

Geologists and Geochronologists are scientists determine the age of fossils and artifacts using dating techniques such as radiometric dating, stratigraphy, and thermoluminescence. Without them, we wouldn’t know that Jebel Irhoud is ~315,000 years old or Omo Kibish is ~233,000 years old. 

Paleoclimatologists reconstruct ancient climates to understand how environmental changes shaped human evolution and migration. Climate shifts often explain why populations moved, mixed, or disappeared.

Zooarchaeologists and Paleoecologists are specialists who study animal remains and ancient ecosystems to understand the environments early humans lived in and how they hunted, gathered, and adapted. 

Anatomists and Comparative Biologists compare human fossils with those of other primates and archaic humans to identify what makes Homo sapiens unique. 

Linguists, while they don’t study fossils, historical linguists contribute to understanding human migrations and population splits through language evolution.

Have Some Popcorn

 

Back in 1630, Quadequine, brother of Massasoit, who was the leader of the Wampanoag tribe, introduced popcorn to the English colonists. 

He offered the snack of the future and movie theater staple as a token of goodwill during peace negotiations. The colonists called it popped corn, parching corn, or rice corn, and it was popped on top of heated stones or by placing the kernels, or cobs, into the hot embers of a fire. 

The Indians did not discover popping corn. People had been consuming it since 300 B.C. In 1948 and 1950, ears of popcorn believed to be 4,000 years old were discovered in the Bat Caves of west central New Mexico. 

In 1650, the Spaniard Cobo said of the Peruvian Indians, “They toast a certain kind of corn until it bursts. They call it pisancalla, and they use it as a confection.” 

The popularity of popcorn has rarely waned, even during the Depression, when its relatively inexpensive cost, at 5 or 10 cents a bag, made it one of the few luxuries even the down-and-out could afford. 

Americans consume more than 17.3 billion quarts of popcorn each year.