Mystery #2Tier 2the body / skin
Why do your cheeks flush bright red when you feel embarrassed?
You say the wrong name in front of the whole class, and within seconds your face is burning hot and glowing red. You did not run anywhere or stand in the sun. You cannot make it happen on purpose, and you certainly cannot stop it. Why do your cheeks light up like a warning lamp the moment you feel embarrassed?

Your guess
What do you think is making your cheeks turn red?
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.