No matter where you are on the earth, three words can find you. It’s not GPS, helpful as that might be. This is an app and website called What3Words, and it has divided the world into squares that are 3 metres by 3 metres. Each square has three words that describe it.

And a great many businesses, rescue services around the world, and even refugee camps are finding it very useful indeed. It can save your life; it can make sure your groceries arrive at your house, and it can help you identify where your tent is located in the refugee camp.