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The article explains that the UV index, which measures ultraviolet radiation causing sunburn, is distinct from the warm sensation of sunlight, which is due to visible and infrared light heating the skin.
A study published in Nature provides direct evidence that inherited genetic makeup influences cancer risk from environmental exposures like smoking and UV rays, explaining why some people develop cancer and others do not. The research in mice shows that genetic background alters how tumours evolve, with implications for personalized cancer prevention and treatment.