SciShow Explains the Teenage Brain by Rollin Bishop at 5:42 pm on March 13, 2014 SciShow host Hank Green explains the teenage brain in their most recent episode. Specifically, Green discusses the ways in which the human brain grows, expands, and changes during adolescence. Being a teenager is hard. Especially when hormones play their part in wreaking havoc on the teenage body and brain. In this episode, Hank explains what is happening to the during the angsty-time.