Matt, Chris, and Don discuss the paper that set off the MMR and autism controversy, dive deep into the peer review system, and Chris and Don leave Matt scratching more than his head with their Amazing and Amusing contributions.

Matt, Chris, and Don review a new study suggesting chocolate may reduce your risk for atrial fibrillation, discuss the difference between observational studies and randomized controlled trials and ask whether Usain Bolt is fast enough to cause a Doppler shift.