A myth dating back to ancient times suggests hippos sweat blood. Hippos don’t sweat at all, but they do secrete an oily reddish “lotion” that acts as sunblock, filtering out the sun’s ultraviolet rays.

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Can You Really Sweat Out Toxins?

You’re in your weekly yoga class, inverted and stretching out your body as piped-in sitar music plinks soothingly in the background. Concentrating, you ease further into the position. A drop of sweat slides down the bridge of your nose and pools on your yoga mat. The instructor croons, “That’s