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Models are great, except they’re also usually inaccurate. In this episode of Crash Course Chemistry, Hank discusses why we need models in the world and how …

Austrian-American Carl Djerassi (1923-2015) was born in Vienna. He revolutionised the field of female contraception when he and his team of chemists …

Basic principles of spectroscopy. Light absorption and bond vibration. Created by Jay. Watch the next lesson: …

https://en.wikipedia.org/wiki/Led

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