A curious symptom of COVID-19 that can stick with patients for a long time is loss of smell. Researchers don't know exactly how prevalent the loss of smell ism and while most people recover from it, some will not. This has given new life to a very specific treatment: smell training. Emily Kwong talks to the Atlantic's science reporter Sarah Zhang about how practicing how to smell might help those who've lost their sense of smell.

For more on smell training, read Sarah's piece in The Atlantic.

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