History's Mysteries

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Inexplicable Life
Join Professor Tyson on a fascinating investigation of the possible origins of life in the universe. Why was Jupiter believed to be a good environment for life in the 17th century? Why is there only one single "tree of life" on Earth instead of multiple ones? Could life have come…
Inexplicable Physics
Turn now to some inexplicable aspects of physics and our physical world. Among the many eye-opening topics you'll learn about in this episode are the discovery of more and more elements on the periodic table; muon neutrinos, tao particles, and the three regimes of matter; the secrets of string theory;…
Ghosts of Murdered Kings
Part of the Series: NOVA
In the rolling hills of Ireland's County Tipperary, a laborer harvesting peat from a dried-up bog spots the remnants of a corpse and stops his machine just in time, revealing a headless torso almost perfectly preserved and stained dark brown by the bog. Archeologists recognize the corpse as one of…
Mystery of the Megaflood
Part of the Series: NOVA
One of the Earth's strangest geological riddles is the evidence for a huge catastrophe that struck eastern Washington State thousands of years ago. It took scientists decades to figure out that a colossal flood had carved out bizarre landscape features strewn across thousands of square miles. On "Mystery of the…
Food for Thought
Part of the Series: The Life of Mammals
Human beings appear to be unique amongst mammals - we live in huge cities, we walk on two legs and we have language. But how far have we really come from our mammal heritage? Are we really as different as we think from other mammals? To answer these questions we…
Rise of the Drones
Part of the Series: NOVA
Drones. These unmanned flying robots-some as large as jumbo jets, others as small as birds-do things straight out of science fiction. Much of what it takes to get these robotic airplanes to fly, sense, and kill has remained secret. But now, with rare access to drone engineers and those who…
Prehistoric Autopsy - Homo Erectus
BBC
Human evolution is not a straight line and prehistory is littered with hominids that never made it. Putting flesh and skin back onto ancient bones, this original series recreates every inch of three of our earliest ancestors. From fragments of bones to a recognisable face, prepare to meet some remarkable…
Why Time Is a Mystery
Begin your study of the physics of time with these questions: What is a clock? What does it mean to say that "time passes"? What is the "arrow of time"? Then look at the concept of entropy and how it holds the key to the one-way direction of time in…
Alien Planets Revealed
Part of the Series: NOVA
It's a golden age for planet hunters: NASA's Kepler mission has identified more than 3,500 potential planets orbiting stars beyond our Sun. Some of them, like a planet called Kepler-22b, might even be able to harbor life. How did we come upon this distant planet? Combining startling animation with input…
Final Frontier? - Guide to the Universe
Part of the Series: Horizon
Over the last 40 years, Horizon has joined scientists as they have probed the secrets of the universe - from the origin of dark matter to the nature of gravity and even stealing a glimpse into the private life of a black hole. Dallas Campbell delves into the Horizon archive…
What's Killing Our Bees?
BBC
Bill Turnbull investigates one of the biggest mysteries in the British countryside: what is killing our bees. It is a question that generates huge controversy. Changes in the weather, pesticides and even a deadly virus have all all been blamed. It is a question that Bill is all too familiar…
Dinosaur Wars
Part of the Series: American Experience
Dinosaur Wars, from producer Mark Davis, is the story of two talented scientists, O.C. Marsh and Edward Cope, whose once professional rivalry soured into a bitter personal feud. Together, Marsh and Cope were responsible for identifying more than 142 different species and for introducing dinosaurs into the American imagination, but…