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    Rethinking the mystery of gravity

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  • Severe solar storm will bring beauty in the sky and potential disruptions

    01:27
  • NASA scrubs Boeing’s Starliner launch

    03:23
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    05:38
  • Worsening allergies tied to climate change and severe weather

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  • Millions gather to celebrate solar eclipse along path of totality

    03:05
  • Meet the woman who has seen 21 solar eclipses

    02:23
  • Scientists will use total solar eclipse to study the sun's corona

    05:16
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    02:57
  • Timelapse videos show darkness of solar eclipse totality

    01:03
  • Special report: Solar eclipse path of totality

    01:44:40
  • Watch emotional moments as skywatchers view solar eclipse

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  • Gadi Schwartz reports on eclipse totality from plane above Arkansas

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  • Total eclipse reaches last stop in the U.S. in Maine

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Green sea turtles make a comeback in Florida

02:22

After coming close to extinction, nesting for green sea turtles has seen a major increase in Florida. NBC’s Mark Potter reports.