Samantha Johnson

Samantha Johnson
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Video: Obama putting billions toward 'smart' power grid

Video: Kayaker takes 70-foot plunge

Video: NASA scientist accused of being a spy

Video: Teen sets sail for solo trek around globe

Video: Inside look at the White House garden

Video: Bay area marks anniversary of 1989 quake

Solar Decathlon 2009

What is green?

The Hubble Space Telescope

Mother Nature in the city

Video: Tea cup pigs are the new pet craze

Video: Nearly-extinct leopard gives birth