Get ready to challenge your perception with these mind-bending optical illusions! Your eyes may see one thing, but your brain ...

Sometimes things are not what they seem. They become poetic thanks to optical illusions. Have a look at this collection of hypnotic, beautiful, and surprising images.

Two NASA astronauts had some fun during the ISS' capture of a robotic cargo spacecraft on April 13, pretending to hold onto ...

Add Popular Science (opens in a new tab) More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results.

Add Yahoo as a preferred source to see more of our stories on Google. Don't stare too long. Spoiler: It’s a trick question. They look kind of purple, but they’re all technically the same blue. But ...

Last August Hinnerk Schulz-Hildebrandt noticed something strange while he was looking at a flight map on his phone. As his eye traced the plane’s flight path, he noticed that the line looked purple, ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Audio & playlist from April 6, 2026 ...