(Roughly) Daily

… Well, our earth is riddled with them. And as our old friend Randall Munroe at xkcd reminds us, some of them are very deep…

“Holes”

Via Jason Kottke, who reminds us that “Explain xkcd has more info on each of the various holes, including the truly bonkers Cave of Crystals in Mexico” (and explanatory background on other xkcd posts as well…)

* Plautus

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As we spelunk, we might recall that it was on this date in 1962 that the U.S. military detonated Little Feller I, a tactical nuclear weapon at the Nevada Test Site as part of Operation Sunbeam. It was the last near-ground atmospheric nuclear detonation conducted by the United States. The high-altitude Fishbowl tests concluded in November of1962 with a detonation at around 69,000 feet altitude. Thereafter, in accordance with the 1963 Partial Test Ban Treaty, tests were conducted underground… more holes.