Tree Bark Shows Global Spread of Toxic Chemicals
The U.S. Environmental Protection Agency has begun a major new risk assessment of 20 flame-retardant chemicals. These compounds have been widely used for decades in many consumer products, from furniture to sleepwear. But the chemicals are toxic. And although they are being phased out, they have become a worldwide pollutant -- and a threat to human health. Measuring their presence in our water, soil, and air has been a major challenge. But as Erika Celeste reports, a new technique promises to make it easier.
Episodes
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November 13, 2019
Ethical AI Learns Human Rights Framework
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April 10, 2018
Disabled Kids Score with Sled Hockey
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March 24, 2018
Theoretical Physicist Stephen Hawking Dead at 76
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March 21, 2018
Comics get graphic at the U.S. National Library of Medicine
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February 26, 2018
Computer Modeling May Become Faster
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February 26, 2018
A Visit to Doc Stone's Studio, Where Fantasy Becomes Reality