Life is a process of dynamic renewal. We’re all shedding about 500 million skin cells every day. That is the dust that accumulates in your home; that’s you. You shed your entire outer layer of skin every two to four weeks. You have five times ten to the 11th blood cells that die every day. If you’re not constantly synthesizing new cells, you die.

What Is Life? A 21st Century Perspective | Conversation | Edge (via rhea137)