Beer drinkers listen up. A Japanese brewer has come up with a novel way to keep cool this summer by designing a machine which adds a frozen froth to your beer. When the notoriously hot and sticky Japanese summer kicks in, many in the country reach for a cold beer and the air conditioner’s on switch. However, with all 54 of the country’s nuclear plants currently offline following last year’s disaster at the Fukushima facility, parts of the nation are facing the prospect of intermittent power outages in the coming months — which could well lead to summer days steamier than a Swedish sauna.