Прочитать буквами.if you're sad see the light! many people feel depressed in winter. and now scientists think they know why.the 1970s,an american engineer called herb kern noticed that in spring and summer he was happy and had a lot of energy, but every winter he became depressed and lazy.he thought it was because there wasn't much daylight in the winter and asked some scientists to make a "light box".he put the box on his desk and after a few days he felt a lot better.in 1982 the scientists gave his illness a name-seasonal affective disorder,or sad