The hair thread is a natural fiber formed by keratin, a protein containing high concentration of sulfur coming from the amino acid cystine. The main physical proprieties of the hair depend mostly on ...
A shape that captured worldwide attention for solving a decades-old mathematical puzzle has returned to the spotlight. While ...
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Dr. Gabriela A. Farfan is the Coralyn W. Whitney curator of gems and minerals, and Russell C. Feather II is collection manager for the National Gem Collection, at the Smithsonian Institution, NMNH. Dr ...
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