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An ancient dog fossil helps trace humans’ path into the Americas

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An ancient bone from a dog, discovered in a cave in southeast Alaska, hints at when and how humans entered the Americas at the...

What you need to know about J&J’s newly authorized one-shot COVID-19 vaccine

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And then there were three: A single-shot vaccine is the latest weapon to join the battle against COVID-19 in the United States. On February 27,...

Readers react to the history of plate tectonics, pandas rolling in poop and more

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Shaking up memories A post–World War II data boom clinched the unifying theory of plate tectonics after decades of debate over whether Earth’s crust was...