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"Well, listen anyway!" Justin began, back in his classroom for the first time in years. "You got a set of Legos. Twenty, fifty, a hundred, it doesn't matter. You make a car out of them for your grandchild, then take it apart. You have the same number as you've started. Those Legos represent energy. They can't be created or destroyed." "What if the Legos get lost?" Kurt asked.
"Then the energy went somewhere else, but the block is still around somewhere. They can be moved around all you want, but the Legos themselves are indestructible." "OK, that's fairly simple," said the Director. "Now here's the problem. We have a kind of energy called potential energy, and specifically I mean gravitational potential energy. All potential energy is based on position, right?"
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