When you move, the fluid moves and irritates the hair

When you move, the fluid shifts and tickles the hairs, telling your brain if you're moving horizontally or vertically.All this tells your body which direction you're moving in,how much you've accelerated,even at what angle.In a car,your vestibular system correctly senses your movement, but your eyes don't see it, especially when glued to a book. The opposite can happen. You're at the movies, and the camera makes a sweeping move. This time, your eyes think you're moving while your ear knows you're sitting still.But why does this conflicting information make us feel so terrible?Scientists aren't sure,but they think there's an evolutionary explanation.