How Albert Einstein's family paid the price for his genius

General Photographic Agency/Stringer/Getty Images Ask people what Einstein did and they'll say "Relativity." (Ask them what relativity is and you'll get an awkward silence. All most people understand about it is that you're supposed to know it's important.) As Walter Isaacson said in his wonderful biography, Einstein "devised a revolutionary quantum theory of light, helped prove the existence of atoms, explained Brownian motion, upended the concept of space and time, and produced what would beco...