Walk through an airport, a cinema or a hotel almost anywhere in the world and the exit is marked by a green panel showing a running figure heading through a…
Stand in front of a bookshelf in an English-speaking country and tilt your head to the right to read the spines. The titles run downward, from the top of the…
Pick up a die. Look at the top face and the bottom face together. They add to seven.
Turn it. Any pair of opposite faces adds to seven - one…
Every deck of cards has one card that does not match the others. The ace of spades carries an elaborate design - a large decorated spade, frequently the manufacturer's name,…
There are an enormous number of traffic cones in the world. They are among the most-produced objects on any road, they are stolen more than almost anything else of comparable…
The two-button flush plate is now standard on new installations across most of the world, and a surprising number of people have no idea which button does what, or press…