Q. Why do we feel dizzy when we spin?
Ans. Inner parts of our ears are the open spaces that are filled with fluid. Inside of the walls of these spaces are covered with hair-like receptor cells which carry the signals to the brain. When we move our head, the fluid inside the spaces also starts moving and pushes the receptor cells which sends a signal to the brain telling it about the movement. The fluid continues to spin even after we stop, giving us a false sense of moving that we call dizziness.