Mystery #3Tier 1-2blood vessels / skin
Why do you get a bruise?
You bash your knee on a table: the skin isn't cut, no blood spills out, yet a day later a purple-blue mark blooms there, then slowly turns green and yellow before fading away. If your skin never broke, where did all that colour come from? And why does it change colour like a tiny sunset under your skin?
Your guess
What's your hunch: if the skin didn't break, what makes a bruise go purple under it?
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.