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Ever since the light bulb's invention 150 years ago, artificial light has illuminated homes, streets, and skies -- but with some unintended consequences.
video
national geographic
documentary
Nearly 90% of the United States population has at least one caffeinated beverage every day. Learn about the chemistry of caffeine, how it causes increased alertness and focus, and how caffeine is capable of causing overdoses.
video
national geographic
documentary
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