Researchers have made a significant advancement in polymer solar cell technology by developing a method to improve molecular interactions using side-chain engineering. This approach eliminates the need for toxic halogenated processing solvents, thereby enhancing the cells’ efficiency and stability.
#science #research #solarcells #chemistry #polymersolarcells

Parts of the Canadian #Arctic observed temperatures up to 10Β°C above the 1981-2010 average during the month of November!

Data from ECMWF ERA5 reanalysis at

Carl Jacobi German mathematician who, with Niels H. Abel of Norway, founded the theory of elliptic functions was born #OTD in 1804.

One of Jacobi's greatest accomplishments was his theory of elliptic functions & their relation to the elliptic theta function which was developed in his great treatise Fundamenta nova theoriae functionum ellipticarum. They are of great importance in mathematical physics because of their role in the inverse problem for periodic & quasi-periodic flows.


"To address questions about the real appearance of St Anthony, we applied body mass estimation equations to the osteometric measurements taken in 1981, during the public recognition of the Saint’s skeletal remains. Both the biomechanical and the morphometric approach were employed to solve some intrinsic limitations in the equations for body mass estimation from skeletal remains. The estimated body mass was used to assess the physique of the Saint with the body mass index."

Mongillo J, Vescovo G, Bramanti B (2021) Belly fat or bloating? New insights into the physical appearance of St Anthony of Padua. PLOS ONE 16(12): e0260505. @science

"Medieval hospitals were founded to provide charity, but poverty and infirmity were broad and socially determined categories and little is known about the residents of these institutions and the pathways that led them there. Combining skeletal, isotopic and genetic data, the authors weave a collective biography of individuals buried at the Hospital of St John the Evangelist, Cambridge."

Inskip S, Cessford C, Dittmar J, et al. Pathways to the medieval hospital: collective osteobiographies of poverty and charity. Antiquity. 2023;97(396):1581-1597. doi: @archaeodons @science

It’s hard not to say β€œAI” when everybody else does too, but technically calling it AI is buying into the marketing. There is no intelligence there, and it’s not going to become sentient. It’s just statistics, and the danger they pose is primarily through the false sense of skill or fitness for purpose that people ascribe to them.

The secrets of Einstein's unknown equation – with Sean Carroll.

"The real Einstein's Equation is part of general relativity, which relates the curvature of spacetime to the mass and energy distributed within it.

Sean explains why the geometry of spacetime has anything to do with gravity, and how this famous equation expresses the way that spacetime curves." @science @physics

"Where Did the Open Access Movement Go Wrong?" This is a really interesting interview. While I strongly support the #OA movement, it's also clear that OA has been coopted by many traditional journals to make money, entrenching barriers to academic publishing for unfunded, nontraditional and marginalised scholars. Leaving many of us unable to afford to publish. (Not forgetting the fantastic mainly-online journals that have no APCs on principle, which I know there are more and more of.)


French physicist Augustin-Jean Fresnel, in a memoir read to the Academy of Sciences, coins the terms linear polarization, circular polarization, and elliptical polarization, and reports a direct refraction experiment verifying his theory that optical rotation is a form of birefringence #OTD in 1822.

After Fresnel, the defining feature of polarized light was that the perpendicular components of vibration had a fixed ratio of amplitudes and a fixed difference in phase. via @wikipedia


Swedish pharmaceutical chemist Carl Wilhelm Scheele was born #OTD in 1742. Scheele discovered oxygen (although Joseph Priestley published his findings first), and identified molybdenum, tungsten, barium, hydrogen, and chlorine, among others. Scheele discovered organic acids tartaric, oxalic, uric, lactic, and citric, as well as hydrofluoric, hydrocyanic, and arsenic acids. via @wikipedia

Books by Carl Wilhelm Scheele at PG:

#books #chemistry

The word 'tooth' is etymologically related to French 'dent', German 'Zahn', Irish 'dΓ©ad', Ancient Greek 'odαΉ“n', and Sanskrit 'dΓ‘n'.

These words stem from the same Proto-Indo-European ancestor.

They are remnants of an ancient present participle meaning "biting".

Here's more:

An international team led by archaeologists from Freie UniversitΓ€t Berlin uncovered fortified prehistoric settlements in a remote region of Siberia. The results of their research reveal that hunter–gatherers constructed complex defense structures around their settlements 8,000 years ago.

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