Note: no animals were harmed in any of the experiments that did not involve animals.
To see if heat affects traffic speed. We expect that traffic speed is independent of small changes in temperature. One handheld hair dryer (blow dryer).
Experimenters stood on the sidewalk of a busy street, aiming the hair dryer gun at oncoming traffic. Traffic slowed down considerably. The hypothesis was not confirmed.
Traffic slows down when it encounters small amounts of hot air. Next Experiment
For more a slightly more serious look at science, check out Science Toys You Can Make With Your Kids.