Season 3 of Tangents is drawing to a close, and we're celebrating by taking a long, top to bottom (literally) look at bodies! To kick us off, we'll be appreciating that brain-holding, eye-having, mouth-possessing orb on top of almost all necks on Earth: the head. Thank you, the head! 

Head to https://www.patreon.com/SciShowTangents to find out how you can help support SciShow Tangents, and see all the cool perks you’ll get in return, like bonus episodes and a monthly newsletter!

And go to https://store.dftba.com/collections/scishow-tangents to buy your very own, genuine SciShow Tangents sticker!

A big thank you to Patreon subscribers Garth Riley and Tom Mosner for helping to make the show possible!

Follow us on Twitter @SciShowTangents, where we’ll tweet out topics for upcoming episodes and you can ask the science couch questions! 

While you're at it, check out the Tangents crew on Twitter: Ceri: @ceriley Sam: @im_sam_schultz Hank: @hankgreen

[Trivia Question]

Embalming head diameter

https://www.sciencedirect.com/science/article/abs/pii/S0021929009001444?via%3Dihub

[Fact Off]

Chicken heads for rabies oral vaccines

https://www.theatlantic.com/science/archive/2015/12/that-time-europe-air-dropped-vaccine-loaded-chicken-heads-to-bait-rabid-foxes/417951/ https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1439-0450.1982.tb01237.x

https://pubmed.ncbi.nlm.nih.gov/31927421/

https://books.google.co.in/books?id=mUu6o7SiSZ8C&lpg=PA71&ots=SlWS7Vyp4u&dq=getting+rid+of+rabies+switzerland&pg=PA71&hl=en#v=onepage&q&f=false

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.500.9910&rep=rep1&type=pdf

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3614052/

Alligator stick hats 

https://www.washingtonpost.com/national/health-science/crocodiles-and-their-ilk-may-be-smarter-than-they-look/2013/12/06/1084cf28-5d2c-11e3-bc56-c6ca94801fac_story.html

https://www.nationalgeographic.com/science/article/what-do-croc-tools-mean-for-dinosaur-innovation?loggedin=true

https://www.livescience.com/41898-alligators-crocodiles-use-tools.html

https://blogs.scientificamerican.com/laelaps/alligators-dont-play-pick-up-sticks-to-lure-lunch/

https://www.newscientist.com/article/dn24750-zoologger-alligators-use-tools-to-lure-in-bird-prey/

[Ask the Science Couch]

Blood-brain barrier

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4292164/

https://www.rndsystems.com/research-area/blood--brain-barrier-permeability

https://sites.duke.edu/apep/module-2-the-abcs-of-intoxication/content-getting-alcohol-to-the-brain-crossing-the-blood-brain-barrier/

https://bmcneurol.biomedcentral.com/articles/10.1186/1471-2377-9-S1-S3

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3494002/

[Butt One More Thing]

Amblyopsidae/cavefish head anus

https://www.discovermagazine.com/planet-earth/scientist-names-blind-fish-with-neck-anus-after-his-favorite-team

https://zookeys.pensoft.net/articles.php?id=3824

http://webhome.auburn.edu/~armbrjw/Amblyopsidae.pdf