Welcome to a very painful science lesson, with your host Hank Green. While he experiences pain. At 1:16, I wince and/or guffaw.
The reason this happened is that Hank Green broke a sacred deal that he has with his brother, John Green. Whenever one of them fails to upload a video on their day of the week, they have to receive a "punishment." Sometimes that means living in a Target for 15 hours. Other times, like on the day of this video specifically, it means doing a science video on pain. Their pain is your gain. Hope you share it.