Among the multitude of California ballot measures approved by voters over the years, few have been as influential, controversial and downright confusing as Proposition 13. Passed in 1978, the measure transformed how state and local governments in California raise and distribute tax revenue, an issue that affects everyone who lives here. Comic journalist Andy Warner explains what it did and why we think you should care. Below that, an excellent Retro Report video on the history of a very controversial measure.