The so-called “shower-curtain effect” is a scientific mystery, but Alex Dainis shares three theories and a solution! The first theory is that the hot air from the shower rises, creating a low-pressure area that pulls the curtain towards us. The second theory is based on the Bernoulli principle, which suggests that the faster-moving air inside the shower is less dense than the still air outside, causing the curtain to be pushed towards us. The third theory is based on a computer simulation that shows a horizontal vortex forming when we run the shower, which pulls the curtain towards us. The Bernoulli principle states that as the speed of a fluid (such as air or water) increases, the pressure within the fluid decreases. This principle is often used to explain the lift generated by airplane wings and the movement of air around objects in fluid dynamics.