What color is your blood. Red, right? Well, actually, yes. So why does it look blue when you see it through your skin? And is everyone's blood always the same color red (spoiler: no)? Do all animals have red blood ('nother spoiler: no!)? And why is red blood red anyway? Hank gives you the facts on vampires' favorite beverage.

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SOURCES
http://omlc.ogi.edu/spectra/hemoglobin/
http://www.biology-online.org/biology-forum/about89.html
http://scienceline.ucsb.edu/getkey.php?key=2927
https://www.imt.liu.se/edu/courses/TBMT36/pdf/blue.pdf
http://science.howstuffworks.com/life/human-biology/blood.htm
http://www.livescience.com/32212-if-blood-is-red-why-are-veins-blue.html
http://newswatch.nationalgeographic.com/2013/07/10/blue-blood-helps-octopus-survive-brutally-cold-temperatures/
http://newswatch.nationalgeographic.com/2013/09/30/why-do-mysterious-lizards-have-green-blood/