Until around 250 years ago in the West, archaeological evidence suggests that most human beings had an edge-to-edge bite, similar to apes. In other words, our teeth were aligned liked a guillotine, with the top layer clashing against the bottom layer. Then, quite suddenly, this alignment of the jaw changed: We developed an overbite, which is still normal today. The top layer of teeth fits over the bottom layer like a lid on a box.
Read more. [Image: Flickr]
In his recent book The Social Conquest of Earth, the great myrmecologist and evolutionary theorist Edward O. Wilson comments at several points on animals with especially complex social behavior. Leading that parade: human beings. A close second: leafcutter ants. It might seem odd that tiny ants, with their necessarily tiny brains, could rival humans in the sophistication of their social order, but it turns out, the science of emergent behavior has shown, that the consistent following of very simple rules can produce exceptionally complicated actions—rather like computers do. Or, to be more precise, exactly as computers do.
Read more. [Image: Antz/ DreamWorks Animation]