In a hall of mirrors, you can see yourself stretched, squashed and multiplied thanks to the reflective physics of mirrors. One mirror reflects onto another, which reflects onto another, and so on. It ...

Introduction Can you imagine a bouncy ball that could bounce back and forth between two walls, infinitely—that is, forever? Wouldn't that be amazing? What if, instead of a ball, light was bouncing ...

You raise your right hand and your reflection raises its left. But the top of your head still points up, and your feet still ...