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, grown-ups insist on soap. If you can't see anything there, what exactly are you washing off?
Your guess
What's your hunch — what are you really washing off, if your hands already look clean?
Make a guess to unlock the hints and the answer.