Here's a faster way to empty a bottle or jug

If you swirl a narrow-necked container to get the liquid inside moving in a vortex, the liquid will pour out much faster. The vortex allows air to flow in as liquid flows out, avoiding that inefficient glug-glug of alternating air and water. — Read the rest

from Boing Boing https://ift.tt/34oAXOd
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