Concurrency.""There are three hard things in computer science: cache invalidation, naming things, off-by-one errors, and Original quote: There are only two

Concurrency.""There are three hard things in computer science: cache invalidation, naming things, off-by-one errors, and Original quote: There are only two hard things in computer science: cache invalidation and naming things. — Phil Karlton The one that most people know: There are two hard things in computer science: cache invalidation, naming things, and off-by-one errors. - Jeff Atwood