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Chasing a Vision Channel: National Geographic Channel Length: 0 Date: March 25, 2009 They mocked the 911 call, but then the police saw it too....what was that glowing light in the sky?

Frustration with the Iron Workers Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Wet concrete is mixed in trucks and pumped to the site by a boom arm.  Workers use the nozzle to pour a steady stream of concrete f...

Experiments with Explosives Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Perhaps the most dangerous step in preparing to implode a building is testing the dynamite — but it has to happen.

Search for Far-Out Objects Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Scientists discover objects in our solar system far beyond Neptune.  Pluto is one of thousands that may be out there.

Exorcism Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Is it Real?: Exorcism

Aircraft Carrier Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Check out what goes on behind the scenes of this massive aircraft carrier.

Skywalker Clears a Car Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Sports scientists look on as the limits of human legsare tested. Watch as Chris 'Skywalker' Lowery attempts to dunk over one of h...

Conjoined Twins Channel: National Geographic Channel Length: 0 Date: March 25, 2009 These conjoined twins are irrepressible and don’t see themselves at pitiable.

On Top of the World Channel: National Geographic Channel Length: 0 Date: March 25, 2009 The view from this 2,000 foot tower is incredible - but Riley and the crew are here to work. And make sure no one drops anything. Except for the oc...

On Top of the World Channel: National Geographic Channel Length: 0 Date: March 25, 2009 The view from this 2,000 foot tower is incredible - but Riley and the crew are here to work. And make sure no one drops anything. Except for the oc...

On Top of the World Channel: National Geographic Channel Length: 0 Date: March 25, 2009 The view from this 2,000 foot tower is incredible - but Riley and the crew are here to work. And make sure no one drops anything. Except for the oc...

Smith & Wesson Gun Channel: National Geographic Channel Length: 0 Date: March 25, 2009 This 50 caliber gun has monster kick. Get inside the Smith & Wesson factory to see the manufacturing of the world’s most powerful revolver.

Gravity, Black Holes and Cosmic Strings Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Stephen Hawking’s theory of black hole and Richard Gott's theory of cosmic strings give hope to those seeking a route to time travel.

Experiments with Speed Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Scientists at CERN work at the world’s largest particle accelerator, asking the question, is time travel not only possible, but inevitable?

Small Flaws, Huge Problems Channel: National Geographic Channel Length: 0 Date: March 25, 2009 See how any small flaw in a water tank can cause massive problems in this test for a super-sized oil rig.

Close Encounters Channel: National Geographic Channel Length: 0 Date: March 25, 2009 When a policeman sees a light in a forest and picks of high radioactivity, like many, he becomes a b

Big Freeze Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Search in caves for evidence that may reveal a sudden climate change in our history.

Polar Station Channel: National Geographic Channel Length: 0 Date: March 25, 2009 Extreme weather makes a polar project difficult.

The True Cost of Gold Channel: National Geographic Channel Length: 0 Date: March 25, 2009 The dream of gold can cost the ultimate price to pursue.

The True Cost of Gold Channel: National Geographic Channel Length: 0 Date: March 25, 2009 The dream of gold can cost the ultimate price to pursue.

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