Mystery #1Tier 2skin / body

Why do you get goosebumps?

When you're cold — or hear a spine-tingling piece of music — tiny bumps pop up all over your skin and your hairs stand on end. You didn't decide to do it. So what is your body up to?

A close-up of goosebumps on human skin with fine hairs standing up — Photo: Ildar Sagdejev · CC BY-SA 3.0 · via Wikimedia Commons

Your guess

What's your hunch — why does your skin suddenly go bumpy and your hairs stand up?

Make a guess to unlock the hints and the answer.