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Elephants don't grow so large overnight. And a new study published in PNAS shows that it takes at least 24 million generations for a mammal the size of a mouse to evolve into something as big as an elephant, reports Veronique Greenwood at Discover magazine's 80beats blog.

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Novavax has begun a phase III trial of its SARS-CoV-2 vaccine, according to the New York Times.

Vox reports that the Trump Administration may limit student visas for individuals from some countries to two years.

The governor of New York says the state will conduct its own review of any SARS-CoV-2 vaccine, NPR reports.

This week in Science: Neanderthal Y chromosomes replaced by Homo sapiens Y chromosomes, and more.