Today I Learned:
1) The Hoover Dam has, near its base, a star chart of very high resolution and accuracy, which can be read to pinpoint the exact day the Hoover Dam was constructed. Why? Well, the Hoover Dam is expected to last about 10,000 years if left to nature... just in case our civilization collapses and somebody runs across it in a few thousand years, we'll have left behind a way they can date it.
Thanks to Mikas Kuprenas for pointing me to this one!
2) Diamonds are very poor electrical conductors, but excellent conductors of heat. This surprised me, but it makes a lot of sense -- the atomic lattice of diamond is very rigid, so vibration at one end is carried very efficiently to the other end.
3) A coat of paint is about 20-30 microns thick.
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