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Published in : 2016-02-16 | by TED-Ed
View full lesson: https://ed.ted.com/lessons/the-science-of-skin-color-angela-koine-flynn When ultraviolet sunlight hits our skin, it affects each of us differently.
Published in : 2016-01-05 | by TED-Ed
View full lesson: https://ed.ted.com/lessons/how-do-solar-panels-work-richard-komp The Earth intercepts a lot of solar power: 173000 terawatts. That's 10000 ...