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Was This Sea Creature Our Ancestor? Scientists Turn a Famous Fossil on Its Head.

17 June 2024 at 11:25
Researchers have long assumed that a tube in the famous Pikaia fossil ran along the animal’s back. But a new study turned the fossil upside down.

Β© Mussini et al., Current Biology 2024

The fossil of Pikaia, a creature that lived 508 million years ago and may have been a close relative of vertebrates.

Scientists Calculated the Energy Needed to Carry a Baby. Shocker: It’s a Lot.

16 May 2024 at 14:00
In humans, the energetic cost of pregnancy is about 50,000 dietary calories β€” far higher than previously believed, a new study found.

Β© Dr. G. Moscoso/Science Source

Researchers estimate that a human pregnancy demands almost 50,000 dietary calories over nine months, the equivalent of about 50 pints of ice cream.

U.S. Tightens Rules on Risky Virus Research

A long-awaited new policy broadens the type of regulated viruses, bacteria, fungi and toxins, including those that could threaten crops and livestock.

Β© Karen Ducey/Getty Images

Working inside a biosafety Level 3 lab at the University of Washington School of Medicine in 2020.

What Makes a Society More Resilient? Frequent Hardship.

1 May 2024 at 11:00
Comparing 30,000 years of human history, researchers found that surviving famine, war or climate change helps groups recover more quickly from future shocks.

Β© Wirestock, Inc., via Alamy

The city of Caral thrived in Peru between about 5,000 and 3,800 years ago. It was then abandoned for centuries before being briefly reoccupied.
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