What happens after you flush your toilet? Many people simply do not know the answer to that question. However, when you get a glimpse at what takes place behind the scenes, you will realize that what happens after you flush your toilet is quite surprising, shocking and a little bit enlightening all at the same time! Interested? Well, Hank Green from Sci Show is going to educate you in this viral video that has become one of the most viewed YouTube videos of the week.