Mystery #2Tier 1-2microbes / health
Why do we wash our hands with soap?
Your hands can look perfectly clean and still need washing before dinner, and a quick splash of water never seems enough, so grown-ups insist on soap. If you can't see anything there, what exactly are you washing off?
Your guess
What's your hunch about what you're really washing off, if your hands already look clean?
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.