Whipped cream performs this rapid changing act because of a phenomenon called "shear thinning." When part of the foam is forced to slide or "shear" past the rest of the foam, the foam "thins." It becomes less like honey and more like water, allowing it to flow easily until the shearing stops.
Above: The thumbnail-sized patch of "window screen" suspended between the electrodes is the paddle that stirred the CVX-2 xenon sample.
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