The Social Conquest of Earth

Guest: Edward O. Wilson, Ph.D.

It seems that blood may not be thicker than water after all. Today on Focus, we're joined by renowned biologist Edward O. Wilson, who in his new book The Social Conquest of Earth claims that human evolution has not been driven by kin selection, but by group selection—meaning that we are not naturally predisposed to put family first. He'll discuss this and more on today's show.

The Earth Moved: On the Remarkable Achievements of Earthworms

Guest: Amy Stewart.

To most people, worms may be nothing more than things to avoid on the sidewalk after a summer shower. But earthworms do much more than that: they plow the soil, fight diseases, and make fertile land out of ordinary dirt. Today's guest on Focus, writer Amy Stewart, takes us underground to investigate the numerous different species of this creature and how they contribute to the health of our planet and population.