TWITTER: https://twitter.com/VsauceTwo
**** SOURCES AND LINKS ***
Humors And Bloodletting History
http://bit.ly/1oxOgmH
Trepanning History
http://bit.ly/1oxOdHL
Enema History
http://bit.ly/XkHWUs
http://bit.ly/1rc2fRh
http://bit.ly/1sZD5np
Great Plague Of London 1665
http://bit.ly/VpVQml
http://bit.ly/XkHXI6
http://1.usa.gov/1vNVabB
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Vsauce Links
T-Shirts: http://www.districtlines.com/vsauce
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Kevin Lieber Links
Website: http://www.kevinlieber.com/
Instagram: http://instagram.com/kevlieber
Twitter: https://twitter.com/kevinlieber
Vsauce: http://www.youtube.com/Vsauce
Vsauce2: http://www.youtube.com/Vsauce2
Vsauce3: http://www.youtube.com/Vsauce3
WEsauce: http://www.youtube.com/WEsauce