When Did People Leave Africa?

We know that our ancestors diverged from other apes in Africa. And for millions of years that’s where they remained. But at some point hominins expanded to other continents, in a series of waves that included our own species roughly 70,000 years ago.

When was the first trip out? The clearest answer to that question would come from skeletons. The oldest skeletons of hominins yet found outside of Africa are about 1.7 million years old, found in the republic of Georgia. But this week, a team of researchers who have worked for years digging into a giant gulley in China, say they have found tools as old as 2.1 million years. Continue reading “Friday’s Elk, July 13, 2018”

The New York Times, July 11, 2018

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The oldest stone tools outside Africa have been discovered in western China, scientists reported on Wednesday. Made by ancient members of the human lineage, called hominins, the chipped rocks are estimated to be as much as 2.1 million years old.

The find may add a new chapter to the story of hominin evolution, suggesting that some of these species left Africa far earlier than once believed and managed to travel over 8,000 miles east of their evolutionary birthplace.

The age of the Chinese tools suggests that the hominins who made them were neither tall nor big-brained. Instead, they may have been small bipedal apes, with brains about the size of a chimpanzee’s.

Continue reading “Archaeologists in China Discover the Oldest Stone Tools Outside Africa”

Wall Street Journal review and more

I’m back from the long journey west. Since I last wrote, there’s been more news about She Has Her Mother’s Laugh.

1. In the Wall Street JournalWilliam Saletan gets it

“Nature’s laws are violated all the time, and the cardinal violator is nature itself. This is the paradox that Carl Zimmer explores in She Has Her Mother’s Laugh: The Powers, Perversions, and Potential of Heredity. Mr. Zimmer, a New York Times science columnist and author, is careful and well-informed. So when he says that research is overturning things you were taught in biology classes, he’s worth heeding. Acquired traits can be inherited. Biological time can turn backward. And monsters are real.” Continue reading “Friday’s Elk, June 29, 2018”

The New York Times, June 28, 2019

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Since 1900, average life expectancy around the globe has more than doubled, thanks to better public health, sanitation and food supplies. But a new study of long-lived Italians indicates that we have yet to reach the upper bound of human longevity.

“If there’s a fixed biological limit, we are not close to it,” said Elisabetta Barbi, a demographer at the University of Rome. Dr. Barbi and her colleagues published their research Thursday in the journal Science.

The current record for the longest human life span was set 21 years ago, when Jeanne Calment, a Frenchwoman, died at the age of 122. No one has grown older since — as far as scientists know.

Continue reading “How Long Can We Live? The Limit Hasn’t Been Reached, Study Finds”

News from the Road

Greetings from the road–or, to be more precise, Palo Alto, where I’m talking tonight at the Commonwealth Club Silicon Valley. Tomorrow I’m zipping over to Denver, to talk with anthropologist Chip Colwell at the Denver Museum of Nature and Science. It looks like we’ll be filmed by the good people at Book TV. When and if CSPAN decides to air our talk, I’ll share the information. Continue reading “Friday’s Elk, June 19, 2018”