Why can’t we control blinking?


Why do we have two sets of teeth – milk and permanent?

Vision in Colour

Why does everything we see appear to be in full expanded colour, when really, all we are seeing is the shade white widely explained to shades of black?


Why does the human nose produce snot?


Why do we have hair?

Water on Earth and in Humans

Is it more than a numerical co-incidence that 70% of the earth is WATER and as much is the composition of water in the human body.