Hydrodynamic levitation is an effect that you’ve probably seen before but seems completely impossible. This is what happens when a stream of water is shot into the air, causing a round object to seemingly levitate. This effect, while similar in visual effect to floating something using a hair dryer, works on a completely different set of physical principles. One of the most bizarre phenomena created from this principle is how the ball seemingly levitates off to the edge of the water stream. If you want to see how this principle works and maybe make a fun summer science experiment for your kids, check out the interesting video below.