For three months, Britons have been advised to keep a wide berth from other people: two metres, to be precise. The two metre rule has been sprayed on pavements, emblazoned at park entrances and ...

One of amateur radio’s many interests comes in portable operation, taking your radio to an out of the way place, usually a summit, and working the world using only what can be carried in. Often this ...

We measure stuff all the time – how long, how heavy, how hot, and so on – because we need to for things such as trade, health and knowledge. But making sure our measurements compare apples with apples ...