See Kate the Chemist make a rain cloud in a jar in Studio 1A!
05:38
Worsening allergies tied to climate change and severe weather
02:02
Coral scientists explain how coral bleaching happens
02:15
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
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Thousands pack Indianapolis Motor Speedway to view eclipse
03:48
Scientists create test-tube burger with lab-grown beef
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Using cattle stem cells and other ingredients, a group of scientists is working to convince the world that a more environmentally friendly meat is needed and can be made in the lab. NBC’s Keir Simmons reports and Dr. Mark Post, one of the scientists working on the project, discusses its importance.Aug. 5, 2013
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