https://www.schneier.com/crypto-gram/
Unsupervised Learning, by Daniel Miessler, on IT Security or "intersection of security, technology, and humans", interesting links frequently:
https://danielmiessler.com/newsletter/
Money Stuff, by Matt Levine, on finance, derivatives, accounting shenanigans, VC, etc., frequently very funny and insightful:
https://www.bloomberg.com/opinion/authors/ARbTQlRLRjE/matthe...