GREED (Grue R E E D) is a formula which was allegedly Einstein's masterpiece. According to Einstein, he lost it while time travelling but found it a few centuries later. He published it as "A Mathematician's Apology". His works are mainly about how to improve something by doing something else. He also indicates that people had to go to a site called gruepedia and make other people's works better. After that, he says that for every greedy review one makes, he or she will get a hamburger. Interesting...