You might not know it, but you very likely use bitumen every day.
Whether heard in a church or concert hall, the tones of a pipe organ are unmistakable. These massive instruments can weigh many tons, but how do they work?
How fast anything spins is partly determined by how its weight is distributed. The closer an object’s weight is to its axis of rotation, the faster it spins. To picture this, imagine an ice skater doing a pirouette. When her arms are extended, she spins slowly.