Source: Wikimedia Commons
On the back of a great many shirts, just below the yoke where the pleat sits, there is a small fabric loop.
Most people have noticed it, nobody…
Turn a padlock over and there is a small hole in the bottom of the body, separate from the keyway.
It has two purposes and they are both important: water…
Near the top of most washbasins, and inside most baths, there is a second opening - a slot or a round hole with a chrome cover on it.
Everybody knows…
The small metal plate at the base of a stapler, the one the staple legs hit, is called the anvil, and on most staplers it rotates.
Turn it and the…
Source: Wikimedia Commons
On the front of an enormous number of backpacks there is a small diamond or rectangle of leather or synthetic material, stitched at its corners, with two parallel…
Take two golf balls of identical weight and size, one smooth and one dimpled, and hit them identically. The dimpled one will travel roughly twice as far.
That is the…