Hank explains the science behind the effects of that wackiest of weeds, cannabis sativa – aka marijuana. Like SciShow on Facebook: http://www.facebook.com/scishow Follow SciShow on Twitter: http://www.twitter.com/scishow Citations http://www.nida.nih.gov/infofacts/marijuana.html http://science.howstuffworks.com/marijuana3.htm http://www.chm.bris.ac.uk/motm/anandamide/ananh.htm http://medicalmarijuana.procon.org/view.answers.php?questionID=637 The Botany of Desire by Michael Pollan http://www.springerlink.com/content/q450642638287947/ http://www.nytimes.com/2008/09/09/science/09obdrug.html Images http://upload.wikimedia.org/wikipedia/commons/d/d1/THC.svg http://upload.wikimedia.org/wikipedia/commons/b/b7/Cannabis_plant2.jpg http://upload.wikimedia.org/wikipedia/commons/f/f9/Rnt_Anandamide.jpg http://upload.wikimedia.org/wikipedia/commons/4/44/Cannabinoid_Receptor.png