Listen to a talk about light and health. Take notes and complete the following summar y. Can Light Affect Your Health? Many researchers believe that __________ can __________ both your __________ and your _______________. From daylight, our bodies _______________ through the skin. Certain ____________ diseases also __________ from __________ to __________. Light absorbed through the __________ can _______________ production, which in turn ________ our __________. Some people become __________ in __________., when the days are __________ and most people spend __________ in the open air. When spring comes, these symptoms __________. Researchers have called this condition SAD- _______________. The condition can be __________ by __________ patients to special lights, known as _______________. This lighting has also been used to treat patients suffering from _______, to improve __________ in school-children in Russia and America, and the __________ of Japanese factory workers. Young people need at least ________________ a day in _______________ in _______. Old people, who risk _______________, should spend even __________ exposed to __________ daylight.