The benefits of sun exposure have been known for a long time. Sunlight is involved in reactions of insulin synthesis, it maintains a balance of skin microflora, vitamin D and serotonin (the so-called hormone of happiness, which controls appetite, sleep, mood and emotions) are produced under ultraviolet light. But the sun is a medication that should be taken strictly in graduated way. Doctors of all the countries are sounding the alarm and warning people about the harmful effects of...