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Air Pressure - How do straws work?
Archimedes principle - Why do ships float?
Blushing - Why do we blush?
Human Hair - Why do we get white hair?
Kidney Stones - What causes kidney stones?
Human tongue - Why does our tongue stick to a frozen pole?
Earthquakes - What causes earthquakes?
Rain - Why does rain smell?
Tooth decay - What causes cavities?
Paper cut - Why do paper cuts hurt so much?