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The legal definition of hemp is a cannabis plant that has no more than 0.3% of THC.
3:32
Insects may have provided humans' ancestors with key nutrients.
3:00
These bones could have belonged to some of the last surviving steppe mammoths in Britain.
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Climbing partners have a harrowing experience on Mount Washington in NH.
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Oral tradition talks about the importance of these foods for Maya.
7:09
Ukraine's 15 active nuclear reactors generate about half of the country's electricity.
6:22
A method of boosting snow and rainfall may help ease drought conditions in the western US.
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How do you make wastewater drinkable? It starts at the sewage treatment plant.
1:59
Wildfire smoke can carry harmful microorganisms long distances.
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When it comes to extreme weather, heat can be a “silent killer.”
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A new film from NOVA examines technologies that could get us to carbon zero by 2050.
6:41
People from all over the country converge on a small Texas town to see a total solar eclipse.
