Perfluorinated acid
A type of chemical that repels water and oil and is resistant to heat and chemical stress. Perfluorooctanoic acid (PFOA) and other perfluorinated acids have been used in the manufacturing process of many products, including Teflon and Gore-Tex, and are used to make polymers for aircraft and electronics. Perfluorinated acids do not degrade and are now widely distributed in food and in human blood samples.
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The inherent human ability to identify a note or sing it without hearing a reference note beforehand. Since most native speakers of languages that use tones to convey meaning have perfect pitch for language, it is now believed that babies are born with perfect pitch but lose it if they do not learn a tonal […]
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