What makes a "perfect poison?" In books and movies, poisoning has always been a popular method of getting rid of one’s enemies, but does a completely undetectable poison really exist? Join Hank Green for a new episode of SciShow and discover 6 of the poisons that have confounded doctors throughout history!
----------
Support SciShow by becoming a patron on Patreon:   / scishow  
----------
Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطا الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz
----------
Looking for SciShow elsewhere on the internet?
Facebook:   / scishow  
Twitter:   / scishow  
Tumblr:   / scishow  
Instagram:   / thescishow  
----------
Sources:
https://www.britannica.com/science/me...
https://www.dartmouth.edu/~toxmetal/a...
http://jmvh.org/article/arsenic-the-p...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://www.chemistryworld.com/opinio...
https://www.health.ny.gov/environment...
https://calpoison.org/news/acute-cyan...
https://emergency.cdc.gov/agent/cyani...
https://phys.org/news/2015-03-cyanide...
http://ccn.aacnjournals.org/content/3...
https://www.washingtonpost.com/archiv...
http://www.slate.com/blogs/crime/2013...
https://calpoison.org/news/thallium-p...
https://www.ncbi.nlm.nih.gov/pubmed/6...
https://www.theguardian.com/world/201...
https://www.theguardian.com/world/201...
http://www.independent.co.uk/life-sty...
https://www.chemistryworld.com/news/p...
https://www.britannica.com/science/al...
https://www.livescience.com/54901-fre...
https://www.poison.org/articles/2007-...
https://calpoison.org/news/diagnosis-...
http://www.motherjones.com/environmen...
http://www.tandfonline.com/doi/full/1...
https://www.webmd.com/a-to-z-guides/w...
http://articles.latimes.com/1988-09-0...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://www.britannica.com/topic/card...
http://articles.latimes.com/1991-04-0...

Images:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...