03:21 — As guns became more accurate, they also became more identifiable. In a landmark case in 1915, bullets were matched to a gun for the first time.
02:50 — When a praying mantis is pregnant, it won't hesitate to eat anything it can reach with its killer grip - even other praying mantises.
02:54 — Elephant families clash over access to the best spot at the watering hole.
02:59 — Martin Clunes witnesses a highly skilled sheep dog at work and questions who has more control over the herd - dog or man.
01:51 — The man who launched the first of many German u-boat attacks on American merchant ships, captain Reinhardt Hartigan, remembers bringing down the SS Cy (more…)
02:39 — When hundreds of curious Americans shine their headlights into the water, they inadvertently assist the German U-boat captains aiming for American shi (more…)
03:45 — Leopards can scale tree trunks and leap 20 feet in a single bound, but at night they really prove their abilities, moving silently on padded feet and (more…)
01:25 — An animated look at the history of the Hope Diamond.
02:05 — How much do you know about the most famous diamond in the world? How much is it worth? Where does it live? How big is it?
00:46 — Curator Roger Launius recalls his favorite memory of space flight.
03:09 — When the Green River Killer is convicted of murder, the FBI brings in Dr. Mary Ellen O'Toole, leading expert in psychopathy, to get the killer to conf (more…)
01:33 — Our innate design skills allow us to thrive in our immediate environment and journey into extreme environments unfriendly to mankind.
01:10 — Hair is forensic toxicology's secret weapon - it keeps a record of a person's exposure to chemicals and poisons even long after death.
02:29 — When duty called, women tied on handkerchiefs, strapped on their hoods and went to work as welders assembling the very vessels that would lead America (more…)
02:55 — While babysitting the pups, meerkat Chloe gets distracted by an attractive stranger.
03:23 — Wolf researcher Shaun Ellis demonstrates his surprising role as a mediator within the wolf pack he's raised from pups.