Kids love gross stuff. Science loves gross stuff. It’s a perfect match. Test which surface holds the most bacteria. Swab your phone, a doorknob, and your dog’s mouth. Grow those little colonies in a petri dish.
You will be horrified. Your phone is probably dirtier than a toilet seat. Pro tip: Don’t lick your phone to prove a point. Present the smelly results with pride.
The Moldy Bread Derby
Bread gets fuzzy fast. But what makes it fuzzier faster? Get four slices of bread. Touch one with dirty hands. Touch one with clean hands. Lick one (yes, really, but just once).
Put each in a separate bag. Wait a week. The dirty-hand slice will look like a green, hairy monster. The licked slice will be a science experiment gone rogue. Your teacher will either be impressed or call your mom.
