Last week, we were investigating how unique our fingerprints are. The students identified the structures that all humans have on their fingertips. The arrangement of these makes our fingertips unique. To make the fingerprints easier to see, the students stamped their fingers onto an unblown balloon. They blew them up and this enlarged the fingerprints.
We then had a look at our agar plates that we made the week before, and found that although there are some differences in the number of bacteria on our hands, it was relatively insignificant. Maybe when we wash our hands we need to sing happy birthday more than twice!