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The UV index measures the intensity of skin-damaging ultraviolet radiation at the Earth's surface. The UV index ranges from 0 to 11-plus, with higher values indicating greater risk of sunburn and skin ...

Scientists were surprised to discover cassowaries glow under ultraviolet light. It may help the birds distinguish between ...

Add Yahoo as a preferred source to see more of our stories on Google. The sun's ultraviolet radiation, a short wavelength of light invisible to humans, can cause sunburns, which can lead to deadly ...

How sunny is too sunny? Sometimes it's tough to know, but as temperatures reach new highs in Michigan, understanding the UV index can help you avoid sunburns and heat-related illnesses. The sun's ...