Good Chemistry
A second-grader mixes mad science and messy fun for a fab lab birthday party.
By Rebecca Miller Ffrench
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Let It Snow

The "snow" powder is made of polymers (long chains of dense molecules) that expand in liquid. Watch kids' eyes widen when they see that 1/4 cup of water can make a teaspoon of powder ($10 for 100 grams, makes two gallons) grow to snowball-size proportions in just a few seconds.

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