Planets with water are the main targets for scientists' search for life on other worlds. Find out how a new study shows that these planets can be very different from Earth.
Male dolphins are healthier and live longer when they have a network of male frends. Find out how a new study revealed that this popularity also makes them more likely to find mates.
Hunter-gatherer culture is often seen as survival of the fittest individuals by brains or brawn. Find out how new studies show that the opposite is true. (4:30 min)