Or consider a ritual that many beer

Or consider a ritual that many beer drinkers in the United Kingdom and Ireland hold near and dear to their hearts: the spectacle of a pub bartender “pulling” the perfect pint of Guinness. According to tradition, the slow pour takes exactly 119.5 seconds as the bartender holds the glass at a 45-degree angle, fills it three-quarters full, lets it settle, and tops it off with its signature creamy head. Guinness wanted to make the pull faster so the bar could serve more drinks on a busy night, so it introduced FastPour, an ultrasound technology that dispenses the dark brew in only 25 seconds. You probably guessed the outcome: The brewer had to scrap the system when