Evan and I had chemistry class today. Chemistry class right now consists of his Magic School Bus Chemistry Kit.
A penny can hold many drops of water because the water molecules like each other and form special bonds between each other. On the surface of the water, the molecules are held together by this surface tension. When too many drops are added, the surface tension is broken and the water spills over. Fewer drops can be put on the penny with the soap because soap decreases the surface tension and the water spills much sooner. [emphasis added]
Yeah . . . right . . . .
I really don't know how we manage to do this. But over and over again, our science experiments turn out with something far afield of the expected result. Just one of our many family talents, I guess.