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Keep close to nature’s heart...and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean."

—John Muir

Videos

The world's first "supercomputers" weren't machines—they were women. Like modern number-crunchers, these "kilo-girls" worked through complex problems.

In 1957, a Soviet street dog named Laika launched into space aboard Sputnik-2 and became the first animal to orbit the Earth. This is her story.