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Caitlin Saks and Arlo Pérez Esquivel team up with fellow NOVA producer Alex Clark to investigate a chemistry problem that has been eating at Alex (or rather, at his classic S13 Nissan Silvia) — rust.

Imagine leaving your shiny metal bicycle outside in the rain. As water pools on its surfaces, oxygen from the air lingers nearby, and together they begin to quietly attack the metal. The iron in the ...