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 ...
The Federal Communications Commission (FCC) approved a startup business’s request to build and launch a mirror satellite that would reflect sunlight back toward the dark parts of Earth. Reflect ...
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5 free sleep optimisation habits that reset your circadian rhythm and beat insomnia by week two
Every sleep optimisation plan starts at the wrong end. People try to fall asleep earlier without anchoring when they wake up. The circadian rhythm is regulated by a consistent wake signal, not a ...
Jadeite has two sets of cleavage, and the reflection of the cleavage plane can often be observed on the surface of the jadeite jade with a coarse or relatively coarse-grained texture, either visually ...
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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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