#paperoftheday from my open tabs : Nature News essay and references, 2017
"The Strange Topology that is Reshaping Physics"
https://www.nature.com/news/the-strange-topology-that-is-reshaping-physics-1.22316
#science #physics
When you wear a mask, you’re saying “I value your life, not just mine.” #COVID19 #coronavirus #2019nCoV #WearAMask
A Mathematician’s Guide to How Contagion Spreads https://www.wired.com/story/a-mathematicians-guide-to-how-contagion-spreads/
#paperoftheday - today let's read
"A Simple Introduction to Particle Physics"
https://arxiv.org/abs/0810.3328
#science #physics #freelearning
uk pol, lgbtq, official parliament petitions
Add gender identity to the characteristics protected under the Equality Act 2010 https://petition.parliament.uk/petitions/301138/
Make LGBT conversion therapy illegal in the UK https://petition.parliament.uk/petitions/300976
Do not ban gender transition treatments for under 18s https://petition.parliament.uk/petitions/318025
Allow for a gender neutral option on a passport, such as an "X" https://petition.parliament.uk/petitions/301083
Remove the criteria for men who have sex with men to wait before donating blood https://petition.parliament.uk/petitions/313693
boring basic relativity
because
ds^2 = dt^2 - dx^2
ds^2 /dt^2 = 1 - v^2
could really use some latex
boring basic relativity
Why is 4-velocity, the proper time derivative of position, automatically normalized to length 1 (or c, depending on unit convention)?
It is related to the vector (1, 3-velocity) by a factor of gamma, the Lorentz factor. Which also happens to be (?) the inverse of the length of the vector (1, 3-velocity). The Lorentz factor is both the conversion between time and proper time derivative and normalizes 4-velocity.
Slash #CO2, Then Wait—and Wait—for Temperatures to Drop
#ClimateAction taken by the world today wouldn't be noticed for #decades to come, according to researchers who say warming on #Earth won't start to slow down for at least 20 years.
And that's probably an optimistic scenario.
Currently, worldwide #emissions are still #rising.
The situation is similar to a "very large ship, which is at high speed," said Marianne Lund, a #climate #scientist.
https://www.scientificamerican.com/article/slash-co2-then-wait-and-wait-for-temperatures-to-drop/
Everyone read this classic essay
"More is Different" , Anderson, 1972
https://science.sciencemag.org/content/177/4047/393
#paperoftheday #science #physics
Corona-Impfstoff: Fünf Irrtümer über die Covid-Impfung - Die Welt wartet auf einen Corona-Impfstoff – mit teils falschen Vorstellungen: Weder wird es nur eine Vakzine geben, noch wird sie wohl alle vor einer Infektion schützen. https://www.zeit.de/wissen/gesundheit/2020-07/corona-impfstoff-verfuegbarkeit-wirksamkeit-forschung-irrtuemer