Once derided by Albert Einstein as “spooky action at a distance”, entanglement demonstrates how some particles are so deeply linked that observing one has an effect on the other, even though they may be separated widely. Photograph: AP Photo/File

Thousands of years ago people made up stories to explain the world. Myths describing the changing seasons often became dogma, morphing into religion. (...)

Santa Claus is coming: With about a billion houses to visit, and the typical distance between neighbouring houses being 10m, it is estimated that Santa will have to travel 10 million kilometres on Christmas Eve

How far must Santa travel on Christmas Eve? At a broad scale, he visits all the continents. In more detail he travels to every country. Zooming in, he(...)