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John Johnson

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  • Don Cornelius: Peace, love, soul -- and civil rights

    Don Cornelius: Peace, love, soul -- and civil rights
    Don Cornelius, who died Wednesday at 75, was a civil rights pioneer disguised as a dance-music-show host. He used to sign off the “Soul Train” show he founded in Chicago by wishing his viewers “love, peace and soul,” and devoted every programming minute to proving he meant it.
  • Scientists zero in on reason for mammoths' demise

    Scientists zero in on reason for mammoths' demise
    About 15,000 years ago, North America was home to an astonishing number of large plant-eating mammals -- giant sloths, mastodons, mammoths. A thousand years later, they were all gone, wiped from the face of the Earth with sudden finality. Scientists have...

    Large Hadron Collider roars to life

    Large Hadron Collider roars to life
    The much-delayed, problem-plagued European Large Hadron Collider, the world's largest particle accelerator, is finally beginning to show off the technological muscle that is expected to produce some of the greatest scientific discoveries of the 21st...

    The universe's past, in close-up

    The universe's past, in close-up
    If there were a Guinness world record for making telescope mirrors, Dean Ketelsen would likely win it. Colleagues boast that the onetime Iowa farm boy has ground and polished more square footage of optics than any human being alive. "It used to be a...

    NASA scientists find hydrogen in moon's sunlit regions

    NASA scientists find hydrogen in moon's sunlit regions
    NASA's lunar-mapping satellite has just begun its four-year mission searching for water on the moon, but it has already turned up a discovery that has scientists scratching their heads. The Lunar Reconnaissance Orbiter's seven scientific instruments have...