0:37 No mercy for sick ants Ants prevent the spread of disease by killing other ants that are infected.
6:25 Acoustic masterminds Tree crickets cut holes into leaves to make baffles that amplify their mating calls.
13:33 Building a placenta Mice that lack a protein called IFNG2 suffer from the symptoms of preeclampsia.
19:18 The hypervigilant brain People with post-traumatic stress disorder pay more attention to surprise.
25:57 Human Cell Atlas Scientists are planning to create a map that contains the molecular fingerprints of every cell in the body.