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Why bread rises: yeast only inflates the bubbles your kneading put there
Yeast doesn't blow bubbles into dough. It only inflates the ones your kneading already folded in. That means the number of bubbles is fixed early, and the…
Why soap bubbles swirl with colour, then turn black just before they pop
Soap has no dye, yet bubbles shimmer with magenta, gold and green. The colour comes from thickness: light bounces off both the front and the back of the film…