Ask them how many fingers you're using, and chances are they will get it wrong.
Why is that? Grab a willing volunteer and we'll find out...
Step 1: Equipment Required
The nerves in your skin are spread out differently in different parts of your body. This activity will show you just how differently.
You need a volunteer who is not too easily embarrassed (if they are feeling really cooperative, they could be wearing shorts & tee-shirt to expose as much polite skin as possible), two full-size pencils, an elastic band, a ruler, and an outline of a body. Any simple silhouette will do, as long as you can write on and around it.