Ancient Americans Crossed Back into Siberia in a Two-Way Migration, New Evidence Shows
Scientists have long known that ancient people living in Siberia made their way into what is now North America. Mounting DNA evidence suggests migration also happened in the opposite directionThe sun rises over the continental divide in Bering Land Bridge National Preserve in Alaska. Credit: Natural History Library/Alamy Stock Photo Science has long known that people
Leona Zacharias Helped Solve a Blindness Epidemic among Premature Babies. She Received Little Credit
Scientist Leona Zacharias was a rare woman. She graduated from Barnard College in 1927 with a bachelor’s degree in biology, followed by a Ph.D. from Columbia University. But throughout her career, she labored behind men with loftier titles who got the bulk of the credit. In the 1940s, when premature newborns were going blind after being
Half of the 250 Kids Expelled from Preschool Each Day Are Black Boys
In early October 2022 Jane Stadnik, a family resource specialist at the Parent Education & Advocacy Leadership (PEAL) Center in Pittsburgh, Pa., got a frantic call from the mother of a three-year-old boy who was about to be expelled from preschool. The school was tiring of his disruptive behavior, which, it claimed, included throwing blocks
Why California Is Being Deluged by Atmospheric Rivers
In an aerial view, cars are submerged in floodwater after heavy rain moved through the area on January 9, 2023, in Windsor, Calif. The San Francisco Bay Area was drenched by powerful atmospheric river events that brought high winds and flooding rains. Credit: Justin Sullivan/Getty ImagesCalifornia is taking a beating from what the National Weather
Scientists See Quantum Interference between Different Kinds of Particles for First Time
For the first time, scientists have observed quantum interference—a wavelike interaction between particles related to the weird quantum phenomenon of entanglement—occurring between two different kinds of particles. The discovery could help physicists understand what goes on inside an atomic nucleus. Particles act as both particles and waves. And interference is the ability of one particle’s
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