Thomas H. Huxley is supposed to have exclaimed after reading On the Origin of Species, “How stupid of me not to have thought of this.” But why didn’t he think of it? Isaac Asimov explores the answer.

In Creativity and Innovation by Brainy Days Ahead

Where does creative genius come from? Initially, what is needed is people who have a good background in a particular field, and who are capable of making a connection between two items or thoughts not ordinarily seeming to be connected. Once the cross-connection is made, the idea becomes obvious. But that’s not the whole story. A certain tendency toward unconventionality is required. There is great and timeless insight here from Asimov. Read the whole thing.