Links for 9th February, 2019

Small change in the posting schedule beginning today: weekends will now comprise of five tweets on Saturday that I found interesting, and just one YouTube video on Sunday (again, that I found interesting).

Here's today's set:

https://twitter.com/JustinSandefur/status/1092887654532825088?s=09

https://twitter.com/jayvanbavel/status/1092939087609294850

https://twitter.com/ValaAfshar/status/1092834940432068612?s=09

https://twitter.com/krishashok/status/1092975935060566017?s=09

https://twitter.com/spectatorindex/status/1093275644056588288?s=09