The paths that lead to new ideas tend to look unpromising. If they looked promising, other people would already have explored them. How do the people who do great work discover these paths that others overlook? The popular story is that they simply have better vision: because they’re so talented, they see paths that others miss. But if you look at the way great discoveries are made, that’s not what happens. Darwin didn’t pay closer attention to individual species than other people because he saw that this would lead to great discoveries, and they didn’t. He was just really, really interested in such things. Darwin couldn’t turn it off. Neither could Ramanujan. They didn’t discover the hidden paths that they did because they seemed promising, but because they couldn’t help it. That’s what allowed them to follow paths that someone who was merely ambitious would have ignored.