Now you can enjoy the perfect pub pint at home from a can thanks to the ingenious widget that won a Queen's Award for Technological Advancement in 1991 and has delighted customers ever since. The 'widget' is actually a plastic moulded device that sits at the bottom of a can until it's opened and then releases a little beer and nitrogen, forcing a surge of bubbles that settle to form the tight white head - in short, the perfect pint at home.