/r/askscience
I left Silly Putty on top of a quarter for over a month, and a blue-green liquid formed between them. What chemical reaction has occurred, and what is this strange liquid?
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We know that people have the ability to have a "perfect pitch" with their hearing. Is there such phenomena with other senses? If not, what is so special about hearing?
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Are vaccines preventative only? Are there any diseases that can be cured by administering their respective vaccine? What's the case for COVID-19?
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The number of colours a human can distinguish is estimated to be in the range of 1e6 to 1e7, how is this range estimated?
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