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Hace 16 horas · Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays.UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.It is also produced by electric arcs, Cherenkov radiation, and specialized lights, such as mercury-vapor lamps, tanning ...
Hace 16 horas · Tobacco smoking is the practice of burning tobacco and ingesting the resulting smoke.The smoke may be inhaled, as is done with cigarettes, or simply released from the mouth, as is generally done with pipes and cigars.The practice is believed to have begun as early as 5000–3000 BC in Mesoamerica and South America. Tobacco was introduced to Eurasia in the late 17th century by European ...
