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

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