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Sea turtle navigation

Video: A "Turtle Positioning System" helps reptiles on their fantastic voyage.
Ecollywood: Rainn Wilson

Video: Rainn Wilson wants to give you his green tip of the day.
Hurricane sleuth

Video: Getting the dirt on hurricanes of the future.
Standing up for Pluto

Video: Dr. Neil deGrasse Tyson of the Hayden Planetarium in New York City talks with Rachel Maddow about his new PBS documentary about Pluto and its status as a planet (or not).
President Obama's call to the International Space Station

Video: Obama congratulates astronauts on ISS and Space Shuttle Endeavour on their successful ongoing mission.
Astronauts open space station's observation deck

Video: Astronauts open the shutters on the International Space Station's new observation deck, offering never-before-seen views of Earth.
NASA scientists plan to approach girl by 2018

Video: A hilarious new parody courtesy of our friends at 'The Onion'. And wait until the end: Best. Scarlett Johansson. Joke. Ever.
Demi Moore on social networking, change

Video: Demi Moore talks to Morning Joe about her participation in the Pepsi Refresh Project, a campaign to fund innovative ideas to advance American communities.
Assignment Earth: New oyster farming

Video: An oyster farm changes its practices and becomes more environmentally friendly.