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If you found some value in digital physics lectures I posted last week, then here’s another. This is a bit different though: it’s three lectures from Hans Bethe, delivered to his retirement community at age 93.

Intended for an audience of Professor Bethe’s neighbors at Kendal, the lectures hold appeal for experts and non-experts alike. The presentation makes use of limited mathematics while focusing on the personal and historical perspectives of one of the principal architects of quantum theory whose career in physics spans 75 years.