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Scientists studying the SARS-CoV-2 coronavirus — which causes COVID-19 — believe they’ve discovered why face masks might help limit transmission of the virus. The virus tends to first infect the nasal cavity, replicating less well in the lower respiratory tract, University of North Carolina (UNC) researchers found. However, sometimes it’s sucked into the lungs, where…  read on >

People infected with COVID-19 who need surgery have much higher odds of dying soon afterward, a new study finds. Infected patients who had surgery died at rates nearly equal to those of the sickest COVID-19 patients in intensive care units, the researchers found. For the study, the investigators looked at data on more than 1,100…  read on >

Americans are ready to rip off their face masks and just have a nice dinner in a restaurant, but the best shot at returning to normalcy — vaccines to prevent COVID-19 — will be in clinical trials for months or longer. The good news is that there are more than 100 vaccines of varying types…  read on >

Back before coronavirus took over the headlines, every week seemed to bring another report about artificial intelligence besting human doctors at everything from diagnosing skin cancer to spotting pneumonia on chest X-rays. But these artificial intelligence (AI) tools — computer programs that get better at performing a task by being “trained” on the right kind…  read on >

New York City finally reopened its economy on Monday after being the epicenter of the U.S. coronavirus pandemic for months, and a new study shows that stay-at-home orders may have been worth it, preventing nearly 60 million U.S. infections. The research, published in the Nature medical journal, examined how different social distancing policies and measures…  read on >

When you’re searching for a misplaced item, it’s helpful to think about its color, size and shape. But Johns Hopkins researchers say traits you can’t see also come into play. The researchers said that volunteers found everyday items in clutter 20% quicker if they subconsciously factored in traits you can’t see, like hardness or softness.…  read on >

How you store your tomatoes doesn’t affect the flavor — what really matters is the type of tomato you choose, researchers say. A team from the University of Göttingen in Germany investigated the differences in flavor of ripe, picked tomatoes when stored in the refrigerator (44.6 degrees Fahrenheit) and at room temperature (68 degrees F).…  read on >