We noticed that a new sign was put up in our neighborhood that shows how fast cars are going when they go by. The kids wondered if the sign would work for them on their bikes. It did measure their speed, so we tried to see how fast we could go! Luckily for us, Tim works for a radar detector company, so he explained to us how those machines work. They need to have a big enough target for the radar to bounce off of. And, we learned that it doesn't have to be metal for it to work. The radar bounces off the object and comes back to the sign. It measures how fast the radar goes out and comes back, and that information is used to calculate the speed. These are "action" shots of Eric and Sam zooming past the sign!
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