Celebs

Matt Damon calls 'The Martian' a celebration of science

My 4 favorite songs from film composer James Horner

Elmo and friends work magic to get little kids cooking

Jon Stewart delivers passionate commentary on Charleston attack

Tommy Chong staying positive in rectal cancer fight

Arnold Schwarzenegger pranks fans for charity

Stephen Hawking's son reveals the pranks he played on his famous dad

Cat people aren't weird: #MeowOUT yourselves!

Leonardo DiCaprio to donate 'Solar Reserve' art installation

Science-heavy thriller 'The Martian' blasts off with first trailer

Miss Piggy 'thrilled' to receive feminism award

Akon creates institution to educate solar engineers in Africa

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