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Researchers have created a kind of "invisible ink for the biotech age" by spreading bacteria — engineered to glow — in encrypted patterns on paper, reports Wired's Brandon Keim. Tufts University chemist David Walt, who co-developed the system, says this "secret agent" application could be used to send cryptic messages.

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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.