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For many people sunlight is a source of well-being. Especially after the long winter we like to stay outside. Sunlight provides positive effects such as heat, stimulation of vitamin D synthesis and release of "feel-good-hormones" such as serotonin - a neurotransmitter of happiness. Many people still underestimate the risk of the sun and its potential to cause skin cancer. Meanwhile, skin cancer is the most common cancer of the Caucasian population, with around 240.000 people diagnosed yearly. This is roughly the population of Kiel in Germany. The incidence of skin cancer is rising rapidly.

The ozone layer protecting the earth from the dangerous ultraviolet rays becomes thinner. According to the World Meteorological Organization (WMO) in Geneva, the ozone layer over the Artic was destroyed by about 40 percent this winter. This means an increasing health risk for the people. Therfore a good sun protection is extremely important.