Pint of GuinnessScience brain teasers require understanding of the physical or biological world and the laws that govern it.
How can it be possible that the bubbles in a pint of Guinness move downwards?
AnswerOverall the bubbles travel upwards, and they do this especially in the center of the glass (free from the drap of the glass), but since they cannot escape at the top of the glass, some (the smaller ones) are forced into a circle and move down around the outside of the glass. Thus some bubbles do move down, but overall they travel up!
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