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    Worsening allergies tied to climate change and severe weather

    02:02
  • Coral scientists explain how coral bleaching happens

    02:15
  • Science class reunites 46 years later to witness total solar eclipse

    04:49
  • 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
  • Teacher makes good on decades-old promise to watch eclipse with former students

    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

    03:15
  • Gadi Schwartz reports on eclipse totality from plane above Arkansas

    06:04
  • Total eclipse reaches last stop in the U.S. in Maine

    04:11
  • 'So memorable': New Yorkers, tourists gather in midtown Manhattan for partial eclipse viewing

    02:27
  • 'Like a cool summer night': Temperature drops as eclipse hits Cleveland

    04:13
  • Animals active as eclipse reaches totality in Little Rock, Arkansas

    04:18
  • 'Just amazing!': Solar eclipse watchers go wild as the moment of totality passes over Dallas

    03:47
  • NBC’s Morgan Chesky and family witness total eclipse in Kerrville, Texas

    04:31
  • Watch: Solar eclipse reaches totality in Mazatlán, Mexico

    04:15
  • Thousands pack Indianapolis Motor Speedway to view eclipse

    03:48
  • Natural reactions: How animals may behave during the eclipse

    02:43

Hadron collider scientists discover three subatomic particles never seen before

07:31

Beneath the Swiss Alps lives the world’s largest and most powerful particle accelerator and recently scientists found three new subatomic particles never seen before. NBC News’ Jacob Ward is joined by Yale University physics Professor Dr. Sarah Demers to discuss how this week’s discovery could help researchers learn how the universe was born and what the future looks like.