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.

Matt, Chris, and Don examine a report on how routines in childhood affect obesity, discuss their takes on how to critically read a journal article, debate the plural of platypus and the science behind the “asparagus smell”, and why neurotic cats need boxes.