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In this installment of "The Big Thirst," the author and Fast Company writer explains why one oft-used statistic about the scarcity of water is misleading. Fact: We hear all the time that "only" 2% of the water on Earth is fresh and available for human use--only 1% if you exclude glaciers and polar ice caps.

In this installment, "The Big Thirst" author and Fast Company writer explains how every drop of water you'll ever know, from the spigot to the toilet, is about 4.3 billion years old. Facts: Two things about water are indisputable. Water is the most familiar substance in our lives, its look and feel and appeal as routine as the spray of the shower or the splash of the kitchen faucet.