Summer Science: Drops of Water on a Penny

It's raining out which inspired me to think about another activity with water.  Something about summer inspires watery experiments.  Get either a pipet or medicine dropper and a penny.  Older pennies minted before 1982 are copper and more defined.  Count how many drops of water the surface of the penny will hold before smashing over.  Sometimes, you'll be able to hit 100.  Why?  Water has unique properties owing to hydrogen bonds.  Water molecules are sticky and create a bubble of water on the penny.  Try it!