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The evidence for sweating it out is promising but incomplete
Catch up on global daily news
Compelling long reads
Tune into captivating conversations
Watch engaging short films
Curated news, direct to your inbox

More sun might improve your heart and immune system. Just don’t get sunburnt

Yes, but be prepared to suffer

Some big studies say yes. Many experts have reservations

Or is it just tasty?

How a Harvard polymath thinks people think

“Heart-rate variability” has been decades in the making