The planarian is nobody's idea of a genius. A flatworm shaped like a comma, it can be found wriggling through the muck of lakes and ponds worldwide. Its pin-size head has a microscopic structure that ...

With full genetic control and visibility into neural activity and behavior, scientists map out chemical's role in behavior. Because serotonin is one of the primary chemicals the brain uses to ...

A millimeter-sized sea animal could hold clues to the evolution of the human nervous system. While placozoans are simple animals only as big as a grain of sand, the blobs have unique cells that could ...