The more you take, the more you leave behind. What am I?

A man fell from a 30-meter-tall building but wasn't hurt; how is this possible? Solve the riddle → A woman has a brother, but her brother has no brother; how can this be true? Solve the riddle → A doctor gives you three pills and instructs you to take one every thirty minutes; how long will it take before you have taken them all? Solve the riddle → What has cities without houses, forests without trees, and water without fish? Solve the riddle → A man walks out into a downpour without an umbrella or rain gear. Yet, his hair doesn't get wet. How is that possible? Solve the riddle →