ANSWERS: 3
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The same way you would encourage boys in science, I suppose.
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Tell them your test tube needs a Bunsen burner...
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Use interesting examples. If you have access to a laser pointer and a night vision device, you can explain the visual light spectrum. If you are certified, take a small bit of pure sodium and drop it in some water (caution required). Use a computer with external speakers, a subwoofer and show them how to seperate ultra sound vs. infrasound (or at least as close as you can).
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