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TIL that the longest echo in a man-made structure is produced in an abandoned oil depot in Scotland, the Inchindown Oil Tanks. The echo lasts for 112 seconds.

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R5vb7 TIL that in 1961, Michael Rockefeller, son of New York Governor Nelson Rockefeller, disappeared in New Guinea while collecting artifacts. It's believed he was killed and eaten by local tribesmen.
Y7KVv TIL The French Navy uses 30:33:37 proportions for its tricolour ensign. When flying in a breeze the fly (right) side appears relatively smaller and the hoist (left) side larger, and the asymmetry is an attempt to correct for this effect.
gMkrb TIL Natalia Molchanova, the "world's most decorated free diver" ever, disappeared while diving off the coast of Spain and has never been found.
4Xnxa TIL that a rock is composed of two or more minerals, while a mineral is composed of the same substance throughout.
awBa9 TIL Obsidian Blades are so sharp that they can cut cells and DNA. They are used are used in modern medicine because the sharp blades create incisions which heal faster.