The Primeagen - What is wrong with us?

This is interesting.

My comment:

4:12 That's an interesting insight. Who TF would want to be generating a maintenance burden at the rate of 10k LOC per day? Have they even given an hour of their precious ratiocination to the question of maintenance? WTF is Y-combinator anyway? YI?

See Numberphile - Sophie Maclean on the Catalan Numbers. 

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