More food! Like on this topic, we have evidence that more than 13,000 years ago, humans in southern Greece were domesticating snails. In the Phronkthe Cave, there's a huge pile of snail shells. Most of them are larger than current snails, suggesting that the people who ate them were selectively breeding them to be bigger and more nutritious. Snails make excellent domesticated food sources, by the way, because a. surprisingly caloric, b. they're easy to carry since they come with their own suitcases, and c. to imprison them, you just have to scratch a ditch around their living quarters. That's not really a revolution, that's just people trying to increase available calories. But one non-revolution leads to another, and pretty soon you have this, as far as the eye can see.