Central forces that decay as 1/r² are special, as they guarantee that all bound orbits are going to be closed (Bertrand's theorem).
Small changes in the power will lead to significantly different kind of orbits.
This is one of the greatest videos of all time. (Original link: https://www.youtube.com/watch?v=GegN_AXWWqc and organization: https://www.saveafox.org/ https://twitter.com/pluizigevos/status/1246923907904319488
Job opportunity in my team @NatureComms@twitter.com. Looking for an editor to cover nanodevice physics and engineering with focus on 2D materials. This is a device-oriented role, so I am looking for someone with a strong engineering mindset and expertise in 2D (opto-)electronics. Link below.
A PhD position to carry computational study and design of layered perovskites for energy applications is available at @theochem_ISCR@twitter.com (@chimie_ISCR@twitter.com, @UnivRennes1@twitter.com) to work with @firstname.lastname@example.org and myself.
More positions available on the group website: https://iscr.univ-rennes1.fr/job-offers.
Appliquant l'article 40 du Code de procédure pénale, trois élus parisiens ont adressé à la justice un signalement contre le @email@example.com de Paris pour «mise en danger de la vie d’autrui» et «propos injurieux ou diffamatoires». Par @firstname.lastname@example.org @Mediapart@twitter.com https://www.mediapart.fr/journal/france/040420/indignation-generale-apres-les-propos-sur-les-malades-du-prefet-lallement?utm_source=twitter&utm_medium=social&utm_campaign=Sharing&xtor=CS3-67
Are contact tracing apps able to get us out of the #COVID19 crisis? A thread. 1/12
🚨 Cool Job Alert!! 🚨
To properly respond to #COVID19 and the challenges it brings @UNICEF@twitter.com is looking to hire
- 2 x Research scientists https://www.unicef.org/about/employ/?job=530910
- 1 x Data Engineer https://www.unicef.org/about/employ/?job=530907
Come join and help make the world a better place!🌎🌍🌏
.@CEITEC_Brno@twitter.com has started testing samples of people suspected of #coronavirus, which are delivered to its laboratories from @FNBrno@twitter.com collection tents. This will strengthen the #testing capacity in the region by up to hundreds of samples per day! https://twitter.com/muni_cz/status/1244921910120644608
Anyone want some great-looking mathematical reading? It’s free too. https://twitter.com/AlexKontorovich/status/1244731670487609348
I just heard the sad news that my colleague Phil Anderson passed away this morning. A giant of 20th century #physics, he changed how we think about so many things. At 96, he was coming to work most days, and still inspiring us all.
Everything about this is Oscar-worthy #CoronaLockdown
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