A bunch of bananas can look, at first, like the ultimate convenience, a graceful cluster of plump arcs nestled together by nature's workshop for efficient transport and storage. And then they all turn yellow, then brown, and before you know you're planning your next batch of banana bread. The sad fact is, bananas don't care one bit whether they fit into your personal snacking schedule—once you've been tempted by their sugary sweetness and grabbed the bunch, their evolutionary purpose of seed dispersal has been achieved. If they all ripen at once, so be it. I'm of course giving bananas agency they don't have. They don't "care" about anything and, with the cultivars we buy at the store today, there isn't a seed inside almost any banana that can grow into a future banana plant.…