@CNN: Ice skaters recorded this frozen lake in Norway ‘singing.’ The unusual frequencies are often a result of changing temperatures shifting the ice. https://t.co/ZxQ5NuSfXV https://t.co/jZt2hVbLo5
Ice skaters recorded this frozen lake in Norway 'singing.' The unusual frequencies are often a result of changing temperatures shifting the ice. https://t.co/ZxQ5NuSfXV pic.twitter.com/jZt2hVbLo5
— CNN (@CNN) January 26, 2019