You are looking at the footprint of a giant sloth – one of the megafauna mammals that died out by the end of the last ice age over 11,700 years ago. Nestled inside is a contemporary human footprint, one of the first concrete pieces of evidence that giant sloths interacted with people. At eight feet […]
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Musical instruments are one of the hallmarks of the radical change in complex culture that started to mark human history after 50,000 BCE. Some scientists even like to refer to our species after this benchmark era as _Homo Sapiens Sapiens_, stressing the “extra” smarts we apparently showcased after this time. But important questions remain. Pictured
The Neanderthal Flute Read More »
Much of south-central Pennsylvania’s landscape is extremely ancient. For instance, a large swath of Cumberland County, where this photo was taken, straddles the Cambrian, Ordovician, and Silurian Ages, dating from 570 million to 417 million years ago. Limestone was one of the major types of soil generated in these millennia. There was also a mass
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Across the millennia, one of our common traits is the desire to feel special: this has been played out in terms of aristocratic status, patriarchal markers, race, and middle-school politics. Finding a solid boundary between “human” and “non-human” is yet another instance of seeking specialness. However, both scientists and historians are making this boundary increasingly
The Human Desire to Feel Special Read More »
Across the world, prehistoric cultures have marked the landscape with monuments expressed as mounds, circles, and ditches. Anthropologists frequently interpret these structures in light of their astronomical or religious focus, but recent research by Lynne Kelly has argued for a more pragmatic function. It turns out, cultures transitioning from nomadism to full-time agriculture across the
Prehistoric Mound Markers and Their Functions Read More »
The rocks shown here lie along the Appalachian Trail close to Port Clinton, Pennsylvania, and are part of one of the oldest mountain ranges in the world. Formed over 200 million years ago, the fact that these peaks are relatively small (the highest – in North Carolina – is only just over 6,600 feet) belie
I hope you’re not too hungry as you read this, because it’s time to talk about cannibalism. Dear readers, although we might recoil now at the thought of consuming human flesh, it turns out that this practice is extremely ancient: cases among Homo Neanderthalis, another early human species called Homo Antecessor, and Homo Sapiens have
Cannibalism Practices of the Ancient Homo Neanderthalis Read More »
Here’s a story for you: the oldest recorded story we know of, in fact. This smudgy cave painting made international headlines last December when scientists in Indonesia reported the discovery of a panel measuring about 14 feet depicting a hunting narrative — this picture is a detail. Dating the mineral deposits atop the pictures, which
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The earliest date that humans first settled in the Americas is something anthropologists do not agree upon – yet. Although whole-genome DNA processing might someday shed more light on the subject, some scholars favor an idea that people first crossed the Bering Straights less than 20,000 years ago, while others argue for an earlier wave
Meadowcroft Rockshelter Read More »
In the north-central region of Maryland, the Catoctin Park has some of the oldest layers of the earth’s exposed mountains. The Appalachians rose out of a collision between plates in North America and Africa 200 million years ago, and parts of the convergence appear here, where the quartzite rocks you see are part of a
Maryland’s Catoctin Park and the Convergence Read More »
The object featured here – a box carved out of whale’s bone – comes from Britain in the early 700s, which was an age of fragmented states and political destabilization. The scene shown is a rendering of the sack of Jerusalem by the Romans, but to the onlooker the most obvious activity is that of
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This little beauty is an artist’s rendition of a Placoderm – an extinct fish from close to 500 million years ago which had a significant feature that has played out into the lives of all humans today. Early fishes from this geological period had jaws, and evolutionary scientists have recognized jawed vertebrate fish as the
The Extinct Placoderm and Adaptive Immune Systems Read More »
Human evolution shows that Homo Sapiens evolved physical features suitable to long-distance running. About two million years ago, the east African landscape entered a drying period, and many forested lands turned into grasslands or patchy open woodlands. These conditions would have favored our ancestors’ development of characteristics that could run after animals and scavenge prey
Human Evolution for Long Distance Running Read More »
Wait: this looks like a science post, but it is really history! Very long-time ago history, like 160 million years ago. But, due to the science of evolutionary genetics, we know this very old story is of immediate relevance to every human, as well as to a very special virus that made our lives possible.Our
Genomes of Our DNA Read More »
Here come two points about human evolution – the first is one that I imagine is not surprising to you, but the second may be, and might make you wince.First, the animal in this photo is not an ancestor of us Homo Sapiens. We did not evolve from apes but share a common progenitor that
Junk DNA and Our Common Ancestors Read More »
Dreams are universally experienced, but take on different meanings across time. In the Aboriginal cultures of Australia, “the Dreamtime” or “Alcheringa” in the Arandic central Australian language, refers not to an individual’s dreams, nor even to the images or narrations that come in sleep. Rather, it signifies an eternal space out of which comes creation,
Dreams in the Aboriginal Cultures of Australia Read More »
Evolution brings a sense of humility like nothing else can. Ladies and gentlemen, may I introduce you to our ancestors? Featured on the first slide is “Kimberella,” probably the oldest of the “protostome” fossils, dating 255 million years ago – from before the pre-Cambrian explosion.“Aha,” you might be thinking. “That doesn’t look like even the
Kimberella – the Oldest Protostome Fossil Read More »
“The difference in mind between man and the higher animals, great as it is, is one of degree and not of kind,” wrote Charles Darwin, in his famous _The Descent of Man_ in 1871. And evolutionary biologists still agree. So then what makes the mental capacities of Homo Sapiens and other hominid apes so different?Two
Brain Size in Homo Sapiens Read More »
Evolutionary history is the focus of my posts for a while, and what better place to start than CRISPR? Last week, Emmanuelle Charpentier and Jennifer Doudna’s work in using CRISPR for gene editing made news headlines – this is the first time the Nobel Prize in Chemistry has been awarded to two women. The future
CRISPR Gene and The Nobel Prize in Chemistry Read More »
It doesn’t look like much now, but this is one of the oldest stone buildings in all of history. It is the Tower of Jericho. It stands on the West Bank of Palestine, and it is 11,000 years old.Now it is dwarfed by the layers of earth that have built up around it in the
