How can smog affect the life expectancy of people? Scientists have investigated the causes and repercussions of The Great Smog of London in 1952, and continue to study the effects of air pollution around the world today.

How do you talk to someone who doesn't believe in climate change? Not by rehashing the same data and facts we've been discussing for years, says climate scientist Katharine Hayhoe. In this inspiring, pragmatic talk, Hayhoe shows how the...

Rain that is unusually acidic, with a pH less than 5.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary...

Dr. Forrester explains the production of electricity and materials used to insulate and conduct it.

Annmarie Eldering describes an experiment on the International Space Station that is gathering data on carbon dioxide around the globe. HWHAP Episode 216.