September 5, 2025

A sand dune is much more than just a big pile of sand. But how do sand dunes work? And what else do scientists want to know about sand? Plus, candles, hair styling products, and other common items can produce toxic air pollution that lingers in our homes. And, former CDC scientist Demetre Daskalakis left his post, citing political interference and a lack of science in decision-making at the agency.

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