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Why shoelaces eventually come undone. Short answer: when your foot comes down, the sudden stop tugs a very tiny bit on the free ends of the bow, and the tiny tugs build up. (via)

A solar-powered device that condenses water out of low-humidity air. Mind you, that 20% humidity is pretty moist for a desert: our evaporative cooler works effectively only below that, which is most of the time outside of rainy season. Good stuff anyway.

There is heat below the surface of Enceladus. (via)

---L.

Subject quote from "Dirge for Two Veterans," Walt Whitman.

Originally posted at http://larryhammer.dreamwidth.org/632735.html (where it has comment count unavailable comments). You can comment here or there.