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…
Source: Wikimedia Commons
In 1960 nobody on a building site wore a hard hat, the scaffolding was lashed together with rope, there were no guard rails at any edge, and the…
Source: Wikimedia Commons
In 1965 a record was made by everybody playing at once, in one room, with the balance set by moving musicians and microphones until it was right, and…