The deepest mine in the world is the East Rand mine, which goes to a depth of about 3,585 metres.

Every second around 100 lightning bolts strike the Earth.

Over one million Pet Rocks were sold in 1975, makine Gary Dahl, of Los Gatos, California, a millionaire. He got the idea while joking with friends about his pet that was easy to take care of, which was a rock.

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