Americans are having a tough time putting on masks. It's become a politically divisive accessory that symbolizes care to some, conspiracy to others. All this has distracted many devotees from a more scientific conversation that's equally important: The quality of our masks matters, and our supply chain isn't ready to support a safe reopening. Sabrina Paseman and Megan Duong realized this—and started working on a technical solution to address it—when they were coordinating N95 collection...

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