/u/NulloK's posts in /r/askscience
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What leaves the biggest carbon footprint? 20 people travelling 1000 miles by plane or 20 people travelling 1000 miles by bus.
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How can the observable Universe have a diameter of roughly 90 billion light years, when it's "only" 13.8 billion years old?
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Why do colors of light with shorter wavelengths, like blue, travel more slowly through most transparent materials than colors with longer wavelengths, like red do?
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