Look under your bed for dust bunnies. If there arent any, look under your roommates bed, the refrigerator, or any similar place that might have some. Once you find them, blow one toward another. Watch carefully and describe what happens as they meet. What happens if you repeat this with another dust bunny? Will these dust bunnies ever have enough gravity to begin pulling themselves together? If they were in space, instead of on the floor, might that happen? What force prevents their mutual gravity from drawing them together into a bunny-tesimal under your bed?.