When you pack for a summer holiday, you probably make sure to bring sunscreen along. But sun protection is also a must for a winter holiday in frosty climes - ultraviolet (UV) radiation from the sun can damage your skin and eyes when it's freezing outside too. "Our skin forgets nothing," says Mark Berneburg, secretary general of the German Dermatological Society (DDG). "Every instance of damage adds to the total damage, so to speak" - and increases the risk of skin cancer. Two factors make prope