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A 68-second animation with captions on screen. The narrator voice and the music are made with AI; the rest is drawn in code. On a warm dark background, a lit glass jar of bubbly sourdough starter under the title "Why is sourdough SOUR?" Two slim tubes appear on the glass: pink, labelled lactic acid, higher, and olive, labelled acetic acid, lower. Inside the paste, cartoon gold yeasts and pink rod-shaped bacteria with little faces float among bubbles. Most pink rods give off pink and olive dots (label: lactic acid bacteria). A second paste panel slides in with a few olive rods (label: acetic acid bacteria). A clock, a thermometer and a water drop appear; the clock sweeps and both tubes rise; the thermometer turns amber, then blue-grey. Outside, the paste rises to a "peak" tick and both tubes climb high. A scoop adds flour, a pitcher adds water, the tubes dip and the lid goes back on. It ends on "What do you like better: a little sour, or really sour?" with opensourdough.com/science.
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