An archive of the secret communications between Benedict Arnold and British army officers indirectly reference Arnold's wife, Peggy. It is the strongest clue yet that she may have been a pivotal figure in Arnold's treachery.

When Continental Airlines Flight 1713 crashed on November 15, 1987, it soon became clear to investigators that initial theories could not be backed up by evidence. They would have to wait for the flight data recorders to be analyzed.

A pair of hungry wolves come up with a smart plan to swindle the swamp bears away from their carrion. While one wolf distracts the bears, the other goes in and steals her fill.

On October 7, 2008, passengers and crew on Qantas Airlines Flight 72 were pulled up from their seats. Immediately after, the plane went into a dangerous and uncontrolled nosedive.

He was the Polish-born hero of the Revolutionary War who went on to save George Washington's life at the Battle of Brandywine. But was Casimir Pulaski also intersex?

A dominant brown bear - dubbed the 'Swamp King' - comes across a younger bear feasting on a kill. He immediately moves in - as the biggest and strongest around, he won't take a backseat to any rival.

In 1941, Naval Intelligence zero in on a Japanese spy named Itaru Tachibana. Raiding his room at the Olympic Hotel in Los Angeles reveals a stash of documents that outlined the extent of his undercover network.

In 1981, President Mitterrand of France took Ronald Reagan to one side and revealed an extraordinary intelligence operation. It was a revelation that would turn the Cold War on its head.

In 2013, a wildlife cameraman from Norway, Asgeir Helgestad, met a polar bear mom whom he names Frost. Over the next few years, their paths would cross again.

Naked mole rats are able to live on low oxygen and can even survive without it - conditions that would kill most mammals. The big question is how have they evolved to do that?