Dirac Equation

Westminster Abbey is hardly obscure: It's on most London tourists' to-do lists. Almost every visitor goes to feel the faintest connection with Queen Elizabeth, Mary Queen of Scots, or any number of other kings and queens. Some may even go to see Isaac Newton's impressive tomb made famous in Dan Brown's The Da Vinci Code.  

But engraved onto the floor in front of Newton's tomb is Dirac's "beautiful" equation that unifies relativity and quantum mechanics. The equation describes the motion of an electron using only eight symbols. From this incredible equation, both antimatter and electron spin were predicted and ultimately discovered.