On today’s episode: Bats in helium fly weird. Invisible lightning is creating invisible, air-cleaning substances! And one of the world's oldest science experiments involves secret treasure maps! All that and more today on All Around Science.

LINKS: * ARTICLE: Researchers raise bats in helium-rich air to check how they sense sound * ARTICLE: Lightning and subvisible discharges produce molecules that clean the atmosphere * ARTICLE: One of the World's Oldest Science Experiments Comes Up From the Dirt

THEME MUSIC by Andrew Allen
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