Bolin Days thread 

At the talks Thomas Mörs says there that exists fossil evidence of a certain species called helmeted frogs in the West Antarctic peninsula, which puts the lower bound for the coldest temperature at 3.7 degree celsius! Amazing.

Personal accomplishment 

Reached a personal milestone that I was working towards for quite a while.
I completed all the requirements of the instructor training. I got badged as a certified instructor. With this many opportunities unlock to share some knowledge that I am passionate about teaching (a.k.a. , , , and basically helping new graduate students).

Call for climate action, depression 

Peter Kalmus (

> Here's my article about the coming epidemic of deadly climate depression among the world's youth, and why getting past is the only way out.

Coincidence? Or divine intervention? 😂

That said, I have been thoroughly enjoying the posts by @unusualbot this week. It is articles, feels like a satire, but true... because citations!

uspol, math video 

Great video by Matt Parker

Why do Biden's votes not follow Benford's Law?


An intermediate sized black-hole.

BHs of mass 10^2–10^5  M⊙, more massive than stellar mass BHs and lighter than supermassive BHs (SMBHs), are traditionally designated IMBHs. A conclusive observation of these objects has thus far remained elusive, despite indirect evidence.

GW190521: A Binary Black Hole Merger with a Total Mass of 150  M⊙ (solar mass).

P.S.: The paper has two software citations, inc. 😄

The fact that both national weather agencies and predicted 0 mm precipitation in the morning and it is drizilling now clearly shows there is more work to be done. It was obvious from the cloud cover that there was a chance of a shower.

Maybe weather predictions should display confidence intervals too!

Tried out the recursive algorithm in for Towers of Hanoi following the video. I see how it works, but it feels like magic. Need some time for this to sink in. (spoilers for solution in attached picture).

Group theory and why I love 808,017,424,794,512,875,886,459,904,961,710,757,005,754,368,000,000,000

An introduction to group theory, and the monster group. Really awesome video by

Fediscience is the social network for scientists.