I had a science teacher that started each new unit with a science trick (magic tricks using scientific principles to make them work). He wouldn't give us the secret of how he made the trick work -- it would always be a 'bonus question' on the quiz. If you understood the science unit you could figure out the trick.
I remember being completely enthralled by the tricks (and completely motivated to learn the science just so I could figure out how the trick worked).
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