Why do we sometimes see a rainbow after rain?, Why does popcorn pop when we heat it?, Why does soap help remove grease from our hands?, Why does water boil at a lower temperature in the mountains?, Why does ice float in a glass of water?, Why do your ears sometimes pop during a flight?, Why do you sometimes forget what you wanted when you walk into another room?, Why do octopuses have blue blood?, Why do cats’ eyes appear to glow in photos taken with a flash?, Why can astronauts become slightly taller in space?

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