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Watch on YouTube

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Facebook's "like" action is a coequalizer.

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And similarly for functors, the effect of U is described by simply erasing some parts of the diagrams (which is easier to demonstrate with chalk!).

-- Steve Awodey. Category Theory, 2010. pp 22-23.

The chalk idea is absolutely brilliant! I tried this technique last night and it worked miracles to clarify my thinking.

Профессиональная деформация

https://labas.livejournal.com/1178642.html

Похожим образом, люди выросшие в СССР все сравнивают с совком так, что он им везде очевиден.

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Если есть вата, то есть и ко-вата. Что бы это могло быть?

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Xi is attempting to scale up the Singapore socio–economic model. After the Great Recession followed by Covfefe, it's hard to make a strong argument in Asia that democracy is required for economic growth. It feels a bit awkward when capitalists argue for tariffs, while communists defend free trade.

TIL: Why do crows rub their beaks?

birds do this for a few reasons. One is to clean off their beaks. The other is to help shape their growing beaks and prevent chips and cracks. The other less studied reason they might do it is to get essential oils from the trees onto their beaks and into their mouths.

https://www.reddit.com/r/zoology/comments/2u76lv/why_do_birds_rub_their_beaks_on_branches/