The Top 5 Deadliest Diseases Ever Known

Coming off of a global pandemic, you might be wondering what some of the deadliest diseases in human history have been. These top five deadliest diseases will have you reaching for the hand sanitizer and praying not to get sick. Join Hank Green for a spooky sickness episode of SciShow! Like SciShow: http://www.facebook.com/scishow Follow SciShow: http://www.twitter.com/scishow References for this episode can be found in the Google document here: http://dft.ba/-3rSt