Watch profilee Israel Liberzon of the University of Michigan discuss his work trying to piece together the neurological routes of post-traumatic stress disorder.
See the American Museum of Natural History curator Mark Sidall explain his fascination with leeches, which he and other scientists are using to infer biodiversity in some far-flung places.
Blast off into orbit, where researchers on the International Space Station are growing plants in systems that may one day sustain astronauts travelling far across the solar system and beyond.