A look at new worlds uncovered by NASA's planet-hunting Kepler Telescope, including whether any are like Earth and the type of life they might support.
A look at the enormous, hydrogen-filled dirigibles that Germany used during World War I to bomb Britain, as well as the defense systems that Britain developed in an attempt to neutralize them.
A look at Typhoon Haiyan, which killed thousands and left millions homeless when it struck the Philippines on Nov. 8, 2013, with 200-mph winds and a two-story-high storm surge.
The discovery of a prehistoric torso in a dried-up bog in Ireland leads archaeologists and forensic experts to investigate the find, which is dated to the Bronze Age.
Examining the 15th-century dome that crowns the cathedral of Santa Maria del Fiore in Florence, Italy. Known as the Duomo, it consists of four million bricks, is taller than the Statue of Liberty and weighs about the same as a cruise ship.
The effort to return apex predators-such as coyotes, bears and panthers-to the wild in order to restore the natural balance to off-kilter ecosystems is detailed.
An examination of the mental prowess of birds. Included: a wild crow focused on an eight-step puzzle; and a raven that can solve a puzzle box so fast that high-speed photography is needed to document it.
How animals use their senses. Included: the differences between wolves and dogs in how they interpret visual information and smells, as well as why they differ; and the ways in which animal brains process information provided by the senses
An examination of animal intelligence. Scientists have observed that many clever creatures live in complex social groups, including apes, dolphins and elephants.
Aero engineers and carpenters attempt to replicate an ingenious escape plan from Oflag IV-C, a POW camp at Colditz Castle in Germany that held Allied officers during World War II, to see if it would have succeeded.
Submersibles, underwater robots and 3D mapping tools are used to discover, identify and plot the relics on the sea floor near Normandy, France, the site of the Allies' D-Day invasion during World War II.
The experts battling to protect data from hackers are spotlighted. Included: the men who discovered an advanced cyber weapon; the computer expert who figured out how to hack ATMs.
An examination of the disappearance of Malaysia Airlines Flight MH370 and how airplane tracking systems could be improved to prevent a similar occurrence.
The daring aeronauts of 18th-century Paris, who took flight in hot-air and gas balloons are recalled. Included: recreations of key flights, including the first manned voyage on November 21, 1783.
Nova's examination or how thousands to terra cotta soldiers in Qin dynasty's terra cotta army were created digresses into reviews of Qin history and technology.
