Look at the cap of a cheap ballpoint pen. There is a small hole in the top of it.
Most people assume it is a moulding artefact, or something to…
Every tyre on every car has a built-in gauge telling you when it is worn out, and almost nobody uses it, largely because almost nobody knows it is there.
It…
Open the fridge and a light comes on. Open the freezer and, on a great many appliances, nothing happens.
The usual explanations are that the cold would break the bulb,…
A tennis ball is a hollow pressurised rubber sphere covered in a layer of fuzzy felt, and the felt is not decoration or grip.
It is the single most consequential…
Every garment carries a row of small symbols on a label, and most people read exactly one of them - the number in the tub - and ignore the rest.…
Source: Wikimedia Commons
In 1960 an officer walked a fixed route alone for a whole shift, with no radio, contactable only at a locked post on the street with a lamp…