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This video clip is about light pollution which has a very negative influence on humans and their environment. It describes how the change of day and night is very important for our biorhythm - we have adapted to it over thousands of years. A large number of important functions of our bodies, among others the production of hormones depend on the time of day. Permanent lighting at night - especially in cities - can lead to health problems. This clip can be used to initiate a discussion into light pollution and associated issues.