Mystery #3Tier 1-2friction / heat
Why does rubbing your hands together warm them up?
On a cold day you rub your hands together and they get warmer, with no fire, no heater, nothing hot touching them. Where does that warmth suddenly come from?
Your guess
What's your hunch about how just rubbing your hands makes heat appear?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.