At 5 am in a wildlife park, yawning zookeepers are a common sight. Turns out, so are yawning elephants.
For over 60 years astronomers believed that there are plasma tubes in the Earth’s magnetosphere. Then, a young astronomy student found them. This is what they look like.
Surface tension is a concept that crops up in conversation from time to time. So what is it exactly, and what does soap have to do with it?
What if we all just disappeared one day? What of the animals, what of the cities?