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?