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Sperm Heaven Channel: National Geographic Channel Length: 0 Date: February 20, 2010 On their long, arduous journey toward Emily’s egg, sperm finally get a little bit of rest in her fallopian tubes.

Sizing Up Sperm Channel: National Geographic Channel Length: 0 Date: February 20, 2010 Sizing Up Sperm uses real people to represent 250 million sperm on their marathon quest to be first to reach a single egg.

Sizing Up Sperm Channel: National Geographic Channel Length: 0 Date: February 20, 2010 Sizing Up Sperm uses real people to represent 250 million sperm on their marathon quest to be first to reach a single egg.

Iran’s Nuclear Program Channel: National Geographic Channel Length: 0 Date: February 19, 2010 Satellite imagery reveals secret nuclear facilities in Iran. Physicist, Richard Muller, tells us how the images are created.

Crop Circle Mystery Channel: National Geographic Channel Length: 0 Date: February 19, 2010 In Wiltshire, England, crop circles abound — but can these mysterious formations stand up to science?

Crop Circle Mystery Channel: National Geographic Channel Length: 0 Date: February 19, 2010 In Wiltshire, England, crop circles abound — but can these mysterious formations stand up to science?

Crop Circle Artists Channel: National Geographic Channel Length: 0 Date: February 19, 2010 To some, they’re artists. To others, they're hoaxers. A group of crop circle makers begins work on an elaborate design.

Manhattan Hurricane Channel: National Geographic Channel Length: 0 Date: February 18, 2010 What if a mega hurricane came blasting through Manhattan? Could we diffuse the giant killer?

Reverse Engineering a UFO Channel: National Geographic Channel Length: 0 Date: February 11, 2010 Electromagnetic propulsion could send a spacecraft farther and faster into space than any propulsion system known to man.

Fighting Blind Channel: National Geographic Channel Length: 0 Date: February 11, 2010 Masters of self-defense use all of their senses when fending off an attack, making it possible to fight in complete darkness.

Saturn: Wild at Heart Channel: National Geographic Channel Length: 0 Date: February 07, 2010 Saturn may look like a serene beauty on the outside, but on the inside, the planet is seething with complex weather patterns.

Saturn: Wild at Heart Channel: National Geographic Channel Length: 0 Date: February 07, 2010 Saturn may look like a serene beauty on the outside, but on the inside, the planet is seething with complex weather patterns.

Hit 'Em Where it Hurts Channel: National Geographic Channel Length: 0 Date: February 07, 2010 Sometimes the simplest techniques can make the difference between life and death.

Hit 'Em Where it Hurts Channel: National Geographic Channel Length: 0 Date: February 07, 2010 Sometimes the simplest techniques can make the difference between life and death.

Jupiter’s Magnetic Maelstrom Channel: National Geographic Channel Length: 0 Date: February 06, 2010 Jupiter’s magnetic field is a radiation hot zone of staggering intensity.

Pin-Up Boy of the Solar System Channel: National Geographic Channel Length: 0 Date: February 06, 2010 The Cassini-Huygens spacecraft sets off on an orbital tour of Saturn, sending back some out-of-this-world images.

Imagining Pluto Channel: National Geographic Channel Length: 0 Date: February 05, 2010 What would it be like to descend to the surface of Pluto?

Come in Pluto! Channel: National Geographic Channel Length: 0 Date: February 05, 2010 The New Horizons spacecraft is set to reach Pluto in 2015, giving us our first glimpse of this faraway world.

The Guy Who Killed Pluto Channel: National Geographic Channel Length: 0 Date: February 05, 2010 When Pluto’s status as a planet is revoked, the public protests.

Venus: Lava Land Channel: National Geographic Channel Length: 0 Date: February 05, 2010 Venus has been tortured by fire. Over 1600 giant volcanoes puncture its surface.

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