Harrison's water is shut off today because of a water main break, so he's extra interested in how water is formed, and how we can conserve it.

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The Big Question: "Will water ever go extinct?" 1) MY GREAT CHALLENGE: In some countries, kids have to carry water from a well instead of getting it from a sink. Our challengers compete to see how much of their daily water they can carry before time’s up. 2) IN THE FIELD: Harrison goes to fire-fighter training, where he puts out real fires with water.