“Keep your feet moving, VZ,” Ms. Hafsaas scolds. (She’s the kind of teacher who likes to call kids by their last names, though apparently Van der Zwaan is a little much.) “You don’t want your muscles to cool down.” “I don’t feel like that’s going to be a problem,” says Agate, but she stops toe-bouncing and starts to sort of jog-bobble in place. “Did you know that the risk of dehydration actually increases when it’s humid?” “Agate, I am your health teacher.” “That doesn’t mean you know things,” says Agate, bobbling away. “And this thing is interesting because it’s counterintuitive.” Oh boy. I
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