One hundred and thirty-five years ago today, Albert Einstein was born in Ulm, Württemberg, Germany. Little did he or the world know then that little Albert would grow up to become arguably the most famous scientist in history.
Despite Einstein's epic genius, he made it quite clear how difficult and important it was to truly understand these ideas and theories he worked on. He's famous for saying, "If you can't explain it simply, you don't understand it well enough." In the 1920s, after the immense popularity of Einstein's theory of relativity, Scientific American put out a contest for the best 3,000-word essay explaining the theory.
Einstein himself said he wouldn't enter because he did not think he could do it.