The opposite sides of a dice cube always add up to seven.
No piece of square dry paper can be folded more than 7 times in half.
More Miscellaneous Facts
Twenty-Four-Karat Gold is not pure gold; there is a small amount of copper in it. Absolutely pure gold is so soft that it can be molded with the hands.
The cruise liner, QE2, moves only six inches for each gallon of diesel that it burns.