Turn on the faucet, and out pours water — a familiar experience for the majority of us in the United States. But where does this water come from? Daniel Schlenk, a professor of aquatic ecotoxicology at the University of California, Riverside, provides an understanding of the unique aspects of water transport and generation. He also addresses what we will need to do in the future to maintain the quality and quantity of water we currently enjoy in California. Series: "Earth 101: What You Need to Know About Life on our Planet" [Science] [Show ID: 24209]