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A Chemist Shines Light on a Surprising Prime Number Pattern
About a year ago, the theoretical chemist Salvatore Torquato met with the number theorist Matthew de Courcy-Ireland to explain that he had done something highly unorthodox with prime numbers, those positive integers that are divisible only by 1 and themselves.

A professor of chemistry at Princeton University, Torquato normally studies patterns in the structure of physical systems, such as the arrangement of particles in crystals, colloids and even, in one of his better-known results, a pack of M&Ms. In his field, a standard way to deduce structure is to diffract X-rays off things. When hit with X-rays, disorderly molecules in liquids or glass scatter them every which way, creating no discernible pattern. But the symmetrically arranged atoms in a crystal reflect light waves in sync, producing periodic bright spots where reflected waves constructively interfere. The spacing of these bright spots, known as “Bragg peaks” after the father-and-son crystallographers who pioneered diffraction in the 1910s, reveals the organization of the scattering objects.

Link: https://www.quantamagazine.org/a-chemist-shines-light-on-a-surprising-prime-number-pattern-20180514/
Mathematics  Science  nct  ncpin  Chemistry  Patterns 
4 days ago by walt74
Being Female in Science
personal accounts and academic citations of sexism for some academic researchers
science  biology  chemistry  blog  social_justice  physics  astronomy  geology  women_in_science 
5 days ago by MsHsi
Sexism | ChemistryWorld
collection of articles on sexism in chemistry
science  chemistry  social_justice  women_in_science 
5 days ago by MsHsi
NCSES Demographics
National Center for Science & Engineering Statistics -- includes numbers for recent college grads, doctoral graduates, women/minorities/disabilities, etc.
science  social_justice  chemistry  physics  biology  geology  women_in_science 
5 days ago by MsHsi
ACS Diversity and Inclusion
member groups of the American Chemical Society
science  chemistry  social_justice  women_in_science 
5 days ago by MsHsi
Discovery Of 1st New Blue Pigment In 200 Years Leads To Quest For Elusive Red
We see colors in nature: a blue sky, a red frog, a peacock's feathers. But those colors are created by the reflection of light off atoms. To reproduce color for paints, cosmetics or dyes, we need pigment. Finding natural ones or creating them synthetically is as complicated as it is elusive.

The pigments need to be stable — not fading in light, or disintegrating with heat. And they need to be nontoxic. So when scientist Mas Subramanian accidentally discovered a new blue — meeting all those criteria — a few years back, he was hailed as a rock star in the world of colors. Now, he's on a quest for red.
Blue  Colors  Arts  Painting  Chemistry 
6 days ago by dbourn
During Prohibition, Federal Chemists Used Poison to Stop Bootlegging
"Chemists with criminal leanings found ready employment during Prohibition. Deborah Blum, author of The Poisoner’s Handbook: Murder and the Birth of Forensic Medicine in Jazz Age New York, writes that the easiest alcohol to convert was Formula 39b—it was mild, intended for perfumes and cosmetics, and 'renatured' almost perfectly into entirely drinkable liquor. As the federal government introduced formula after formula, chemists managed to distill out the danger. According to Blum, by 1926, the federal government had retired three formulas entirely, since bootlegger chemists had gotten so good at distilling them away. A former administrator remembered raiding illicit distilleries and finding advanced chemistry setups on site."
a:Anne-Ewbank  p:Atlas-Obscura★  d:2018.05.09  w:1000  alcohol  chemistry  public-health  from twitter
6 days ago by bankbryan
Is Polymer Clay Safe? - The Blue Bottle Tree
" ... discussions of the toxicity of polymer clay always bring up the question of using a clay-dedicated polymer clay oven for baking. This is absolutely and unequivocally unnecessary. ..."
safety  chemistry  polymerclay  fimo  crafts 
7 days ago by geekgirl397
A Chemist Shines Light on a Surprising Prime Number Pattern | Quanta Magazine
When a crystallographer treated prime numbers as a system of particles, the resulting diffraction pattern created a new view of existing conjectures in number theory.
chemistry  math 
7 days ago by cito

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