You know that crazy hair, the grandfatherly demeanor, and the very famous formula almost everyone who went through physics knows by heart. Albert Einstein was a German-born physicist who came to United States before World War II. He's best known, of course, for his theory of relativity, which eventually became one of the two main guiding principles of modern physics. With this and his other contributions to science, the Royal Swedish Academy of Sciences awarded him the Nobel Prize for physics in 1921. Much like any famous historical figure, many collectors seek rare and vintage items related to this great man, like an original letter he penned or an Einstein poster. eBay has numerous items on sale at any given time, including collectibles from the Father of Modern Physics. The Albert Einstein legacy lives on today and truly, the world would be a much different place if he never put that famous formula together and people's lives would be much different.