Revealed: How to pour the perfect pint of Guinness this St Patrick's Day, according to science

A cool, refreshing pint of Guinness is a traditional and delicious way to celebrate St. Patrick's Day. But coaxing out the perfect cascade of lively bubbles and a thick, creamy head is an art that puts even the best bartenders to the test. Now, scientists have revealed the exact method for pouring the perfect pint of stout. And they agree that the famous 'two–stage pour' is far more than just a marketing gimmick. However, experts say there is no magical perfect time to let your pint rest between pours, with exact timing coming down to the sharp eye of an...