Very often in science one finds that there are ideas in the air, and lots of people hold them, but they don't even realize they hold them. The person who can crystallize them, and lay out not only the central idea but its implications for future scientific research can often make a tremendous contribution. And I think that's what 'The Selfish Gene' did. Lots of scientists, they'd been Darwinians all their lives, but they'd been inarticulate Darwinians. And now they really understood what was foundational to Darwinism and what was peripheral. And once you understand what is foundational, then you begin to deduce conclusions.