It's not that mathematicians have been searching for numbers that differ by exactly two. But what they want to know is if there an infinity of them?
A major advance in mathematics, and the gist of it made a 14 year-old I know chuckle. Well, here’s a parallel. Say you’re searching for objects that are exactly two inches long—some school project perhaps. Along comes a friend who says: “Pssst! I know where you’ll find many objects, all less than 70 million inches long!"