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National Christmas Tree Lighting Ceremony

President Obama speaks before the lighting of the National Christmas Tree on the Ellipse. December 1, 2011. tags: Christmas Christmas tree Christmas tree lighting Ellipse holidays Malia Obama Michelle Obama

First Lady Michelle Obama Reads 'The Night Before Christmas' with Kermit the Frog

First Lady Michelle Obama and Kermit the Frog read 'The Night Before Christmas' at the National Christmas Tree Lighting Ceremony. December ... tags: Christmas Christmas tree Christmas tree lighting Ellipse holidays Kermit the Frog Malia Obama

Shootout near White House: Washington Post

Washington Post has reported that Law enforcement authorities in Washington were investigating a report late Friday that gunshots had been ... tags: Ellipse firing Law enforcement authorities newsx Shootout Washington monument White House

Mod-02 Lec-13 Light Ellipse, Passage of Light Through a Crystal Plate

Experimental Stress Analysis by Prof.K.Ramesh,Department of Applied Mechanics,IIT Madras. For more details on NPTEL visit tags: Crystal Ellipse of Passage Plate ThroughCrystal

Real World: Comets - It's Done With Math

NASA engineers are finding new uses for old spacecraft as a way to study comets. Find out how a repurposed spacecraft can return to a comet ... tags: angular size Comet Hartley 2 comets Deep Impact distance eclips Education

Are Southern Hemisphere Seasons More Severe?

Are Southern Hemisphere seasons more severe because of the eccentricity in Earth's orbit tags: aphelion ellipse heat perihelion seasons specificaphelion