Wisdom Quarterly points us to a YouTube video featuring Tibetan tumo practitioners drying wet sheets on their bare bodies in cool temperatures. All the while a Harvard professor discusses the wonders of meditation, tumo practice—a  technique through which meditators raise the surface temperature of their skin—being just one of them. The four-minute clip is from a documentary that investigates speculation that a meditating monk mummified himself—possibly through tumo practice—but no one seems to be speculating about why anyone would do such a thing.

Take a look:

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