One day, a physicist, a biologist, and a chemist go to the ocean. "Wow," says the physicist, "Look at those waves, and fluid dynamics! I want to learn more." So he goes off into the ocean, and doesn't return. Then the biologist goes, "Wow, look at all the life in there. All the flora and fauna! I want to learn more." So he toddles off into the ocean, and doesn't return. The chemist waits around for a while, then makes a note, "Physicist and biologist are soluble in salt water."