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.

Add up opposing sides of a dice cue and you'll always get seven.

A bolt of lightning can reach temperatures hotter than 50,000 degrees Fahrenheit - five times hotter than the sun.

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