I’m with Jonah on the genetic modification of food. Seedless grapes are the result of genetic experimentation. The tomatoes we eat are derived from a wild plant that produced little red berries, way back before prehistoric farmers started wondering if they could make them bigger and yummier. Kiwi fruit derives from the Chinese gooseberry, which is not edible. Cabbage, cauliflower, and broccoli are all from the same original plant. And that’s just for starters. Here’s a pretty good essay on crop evolution, by C.S. Prakash.