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What good does it do you? Well, the atoms that are you are now eating, sleeping, farting and posting comments on HN.

That's pretty interesting, given that it's much more likely that they'd be undergoing nuclear fusion as part of a star, or clumped together as a planet or an asteroid.

Dawkins is pointing out how neat this is as a way to get people interested in science. As Feynman pointed out, it's neat to take the world from another point of view.