Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

The regular Short Wave science roundup covers mysterious red dots in space, the neurons behind optical illusions and a study of octopus arms. It's time now for our science news roundup from Short Wave ...

In one go, this image might look pretty simple, but is it? The grid is filled with black dots, but if you stare for a little longer, the brain begins to play tricks on you. This illusion works because ...