Why do women have shriller voices than men? plus 9 more videos..

Frequency - Why do women have shriller voices than men?
Diffusion - Why can we smell hot food from a distance?
Density - Why does an iron nail float on mercury and sink in water?
Earthing - Why do buildings have lightning rods?
Speed of Sound - Why does sound travel faster in summer than in winter?
Ignition Temperature - Why does a match light when you strike it?
Wavelength - Why red is used as a danger signal?
Good and Bad conductors of Heat - Why are two thin blankets warmer than one thick blanket?
Comets - Why do comets have tails?
Lateral Inversion - Why is ambulance written in reverse?