Year 3 · eighth unit
Germs cannot move by themselves. They always ride on something. Know the route and you can block it.

How many will it be in a week? First just run it, then switch on handwashing and run it again.

On the left are the routes germs take; on the right, ways to block them. Drag from a gold dot on the left to the dot of its match.

Compare with soap and without.
