Wash your hands first. Fold a paper towel. Line the inside of a clear cup with it. A grown-up wets the towel so it is damp. Push a dry bean between the towel and cup. Put it about halfway down so you can see it. A grown-up adds a little water to the bottom. Set the cup in a warm spot. Check it every day. Keep the towel damp.
Safety first
Never eat the bean or the sprout. Keep beans away from babies and pets. A grown-up pours the water. Wash your hands when you are done.
For a grown-up
Next week the bean cup is used to watch roots. Ask: what do you think will come out first? Praise good guesses, even ones that turn out wrong.