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In human body, we tested our reactions for touch, hearing, and sight. My partner dropped a ruler and and did some kind of signal before to tell me to catch it. It was harder to do the sense of touch than the sense of hearing. I could use the sense of smell to catch the ruler by making my partner spray perfume right before he or she drops the ruler. The eyes see that the ruler is falling then the nerves tell the brain to catch the ruler, then the brain tells the hands to catch the ruler.