Read the excerpt from A Black Hole Is NOT a Hole by Carolyn Cinami DeCristofano.

The scientist who forgot to eat his lunch was busy cooking up a whole new way of thinking about gravity. He was a radical smarty-pants—somebody with a wild imagination. Someone whose brain could surprise even himself.

Albert Einstein didn't mean to turn the universe upside-down on everyone. He didn't plan on leading others to discover black holes. At first, all he set out to do was think about motion, along with a few other related ideas. But almost before he knew it, he had suddenly made our dependable old universe seem strange and new.

Which sentence is the best summary of the excerpt?

Albert Einstein was a radical smarty-pants and somebody who had a wild imagination.
Albert Einstein accidentally changed people’s understanding of the universe with his ideas about gravity.
Black holes were discovered by scientists who were so busy they forgot to eat lunch.
It is lucky that Albert Einstein thought about gravity, or scientists would not have discovered black holes