Why are bubbles white?

Why are bubbles always white? What does a thrusting rocket push against? How do we know a random number is random?
17 May 2013
Presented by Chris Smith


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?


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