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In the April 8 Washington Post column on "5 Myths," the paper addresses water:

"Water is the most familiar substance in our lives, and the most important. Every cell in our bodies is plumped full of water; every heartbeat, every thought — including thoughts about water — happens only because of the cascade of chemistry that water makes possible. Yet we know almost nothing about water, starting with such basics as: Where does our water come from? Where does it go once it disappears down the drain? In fact, even what we think we know about water is often wrong."

Read about the five myths