We have merchandise: http://dft.ba/-HCTMerch There's a flu shot for the flu. But what about colds? Does anything work? Let's find out. . For those of you who want to read more, go here: http://theincidentaleconomist.com/wordpress/?p=60270 John Green -- Executive Producer Stan Muller -- Director, Producer Aaron Carroll -- Writer Mark Olsen -- Graphics http://www.twitter.com/aaronecarroll http://www.twitter.com/crashcoursestan http://www.twitter.com/johngreen http://www.twitter.com/olsenvideo