Is it possible to exercise too much? How can I tell if I’m overdoing it?
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(Christie Aschwanden/ The New York Times) — You’ve probably been told countless times that exercise is good for your health and fitness, and it’s tempting to assume that more is automatically better. But as with so many other good things in life, there comes a point of diminishing returns, and it’s possible to overdo it.  …

The four most urgent questions about long COVID
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(Michael Marshall/ Nature) — When Claire Hastie fell ill in March of last year, she reacted the way she usually would to a minor ailment: she tried to ignore it. “It started off incredibly mild,” she says. “I would normally have paid no attention to it whatsoever.”

But within a week she was flattened. “I had just never felt ill  …