How much harder would it be to burn the black paper with a laser from up close to, say, a kilometer? How much does the output power change at various distances? -
How much harder would it be to burn the black paper with a laser from up close to, say, a kilometer? How much does the output power change at various distances? -
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The world's fairs as spaces of global knowledge: Latin American archaeology and anthropology in the age of exhibitions | Journal of Global History | Cambridge Core
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