Before he died, Stephen Hawking shared one final warning for humanity. The professor, who would have turned 83 today (8 January), died back in March 2018 but seemed to have an eerie insight into ...
Ultraviolet (UV) radiation is a type of light. Sunlight has UV rays, along with other kinds of rays. Some light bulbs give off UV rays, too. UV light bulbs are used in tanning beds and lamps, some ...
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