Why are bubbles white?

What attracts malaria-infected mosquitoes to people? How happens to the brain during adolescence? Why are bubbles always white? Would a sealed box containing an exercising person get lighter? What does a launching rocket push against? Why is water from the hot tap initially cold? What actually is a random number? And is there a formula to calculate the size of a parachute? Like this podcast? Please help us by supporting the Naked Scientists