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On a recent afternoon, Gérald poured less than a cupful of cooking oil into an old water bottle and handed it to a young boy.

Cope asks Truelove if he wants coffee and fetches a small paper cupful before asking about his living situation.

Each child participated, lowering a cupful into the water and tipping it until the eggs tumbled out and settled on a metal screen.

"A simple-minded but perfect way to master the movement is to practice outdoors with half a cupful of dried beans."

Beat a single egg white, he wrote, and you’ll end up with “a cupful of snowy white foam, a cohesive structure that clings to the bowl when you turn it upside down.”