John Solomon
John Solomon asked Stuart Gibbs:

In the book Evil Spy School, when Erica threw the ball over the fence in the gated community nothing happened but when they went over the wall a alarm went off. Is that a mistake? I just wanted to know. -John Solomon

Stuart Gibbs There is a big difference between a ball going over a fence and a person. A human is approximately 200 times larger than a ball (and two people are 400 times larger.) If the bad guys had a laser grid over the fence, it would be triggered by something as large as a person, but not as small as a ball -- or otherwise it would go off every time a bird flew over or a squirrel ran along the fence.

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