In high school, you probably learned that trigonometric functions – like sine, cosine and tangent –can be derived, geometrically, from a circle (hence why trig functions are also known as "circular" functions). But what happens if you use a square to derive these functions, instead? Or a triangle? Or a heart?
This may look like a magic trick, but YouTube user Brusspup is just using the science of sound waves and camera frame rates to make this stream of water dance.
The next time you're in the shower, try pouring a steady stream of shampoo into an open, flattened palm. See how the thread loops and buckles as it comes into contact with your hand? Physicists who study fluid dynamics call this behavior "the rope-coiling effect;" it's a physical property commonly observed in…