Composite image of earliest humans and wooly mammoths
New Evidence Complicates the Story of the Peopling of the Americas
New techniques have shown that people reached the New World far earlier than the long-standing estimate of 13,000 years ago, but scientists still debate exactly when humans arrived on the continent—and how.
New Evidence Complicates the Story of the Peopling of the Americas
New Evidence Complicates the Story of the Peopling of the Americas

New techniques have shown that people reached the New World far earlier than the long-standing estimate of 13,000 years ago, but scientists still debate exactly when humans arrived on the continent—and how.

New techniques have shown that people reached the New World far earlier than the long-standing estimate of 13,000 years ago, but scientists still debate exactly when humans arrived on the continent—and how.

ABOVE: composite from: © istock.com, Homunkulus28 ; © alamy.com, MARK GARLICK, SCIENCE PHOTO LIBRARY
biological invasions, evolution
Illustrated map showing where evidence was found of the earliest humans
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Image of sperm hooks (<em>Peromyscus maniculatus</em>)
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The discovery could add weight to the hypothesis that the building blocks of life on Earth originally came from space, but some scientists note the possibility of contamination.
A headshot of Matthew Gage
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Amanda Heidt | Apr 20, 2022
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Lisa Winter | Apr 19, 2022
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Between Ape and Human book cover
Book Excerpt from Between Ape and Human
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Photo of Ana Marija Jakšic
Ana Marija Jakšić Shapes Fruit Fly Brains
Chloe Tenn | Apr 18, 2022
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Between Ape and Human book cover
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Dan Robitzski | Apr 7, 2022
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Slime mold colony with volcano-like fruiting bodies
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Natalia Mesa | Apr 4, 2022
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Sophie Fessl | Mar 22, 2022
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Drosophila melanogaster on cactus leaf
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A bright, illuminated, yellow cluster of spheres, representing a mutated base pair, stands out from a double helix of deep red base pairs joined by blue hydrogen bonds
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Dan Robitzski | Mar 17, 2022
New research finds that the appearance of the HbS mutation, which protects against malaria but leads to sickle cell disease when present in two copies, was more common in sperm samples from men in Ghana, where malaria risk is high, than Europeans.