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Roozbeh Daneshvar
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What If? 2: Additional Serious Scientific Answers to Absurd Hypothetical Questions, by Randall Munroe

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You can’t use lenses and mirrors to make something hotter than the surface of the light source itself. In other words, you can’t use sunlight to make something hotter than the surface of the Sun.
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What If? 2: Additional Serious Scientific Answers to Absurd Hypothetical Questions
What If? 2: Additional Serious Scientific Answers to Absurd Hypothetical Questions
by Randall Munroe
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