Harold Urey

The discovery of deuterium and the marked differences in the physical and chemical properties of hydrogen and deuterium, together with an efficient method for the separation of these isotopes, have opened an interesting field of research in several of the major branches of science.

In general, exchange reactions for the lighter isotopes have equilibrium constants sufficiently different from unity, so that the ratios of concentrations of the isotopes in two compounds which are in equilibrium differ by a few per cents in nearly all cases.

I was badly bullied when I was in the seventh grade - relentlessly, mercilessly - by a group of 12-year-old girls. And it left me with a determination that no matter what, I had to throw my shoulders back, stick out my chin, and project a sense that no one and nothing could hurt me. That turned out to be a life-changing mistake.