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An international team of scientists has sequenced the DNA of two extinct Tasmanian "tigers," finding that the two animals were extremely similar to each other with only five differences in 15,492 nucleotides. Their findings suggest that the Australian marsupials, which looked like dogs but were evolutionarily more closely related to kangaroos and koalas, died out about 70 years ago because they may have become too inbred to survive.

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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.