This is part 2 of our three-part series where we make sense of the alphabet soup of acronyms for database consistency models. In this episode of Mobycast, we learn how the explosion of the Internet created new challenges for strongly consistent systems, leading to the "discovery" of the CAP theorem. The CAP theorem reminds us that as systems scale, errors will become more likely, forcing us to choose our priorities. We also learn what Chris shares in common with Eric Brewer, the creator of the CAP theorem. It's a roller coaster ride that comes to a crashing halt.