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. Many historians also argue that without agriculture, we wouldn't have all the bad things that come with complex civilizations like patriarchy, inequality, war, and unfortunately famine. And as far as the planet is concerned, agriculture has been a big loser. Without it, humans never would have changed the environment so much, building dams and clearing forests and more recently drilling for oil that we can turn into fertilizer.