Tangents' annual descent into horror returns with Trick or Treat Month! And this time, we brought some fiendish friends along! Join us for a whole month of spooky themes and special guest stars! 

Trick or Treat Month reaches it's horrific, blood-soaked conclusion! And who better to help us wade through the pools of gore than Dr. Sydnee and Justin McElroy, co-hosts of the medical history podcast Sawbones? No one, that's who!

Want more Sydnee and Justin? Check out https://www.blectar.com to find the whole McElroy family of podcasts, including Sawbones!

Get your extra-scary SciShow Tangents Halloween Decal here! Tell 'em Spooky Sam sent you!

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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

[This or That]

Round 1 - Bat tongue

https://www.livescience.com/52305-bat-tongues-move-like-human-bowels.html

https://www.science.org/doi/10.1126/sciadv.1500525

Round 2 - Ground finch beak

https://www.smithsonianmag.com/smart-news/why-some-darwins-finches-evolved-drink-blood-180976814/

https://www.jstor.org/stable/2408396?origin=crossref

https://microbiomejournal.biomedcentral.com/articles/10.1186/s40168-018-0555-8

https://gizmodo.com/meet-the-worlds-most-amiable-vampire-the-hood-mockingb-1742955703

Round 3 - Snail proboscis 

https://bmcgenomics.biomedcentral.com/counter/pdf/10.1186/s12864-015-1648-4.pdf

https://www.marinespecies.org/aphia.php?p=taxdetails&id=527497

https://micro.magnet.fsu.edu/primer/techniques/fluorescence/gallery/snailradulalarge.html

https://www.journals.uchicago.edu/doi/abs/10.2307/1541716

Round 4 - Possum tongue

https://www.dcceew.gov.au/sites/default/files/env/pages/a117ced5-9a94-4586-afdb-1f333618e1e3/files/33-ind.pdf

https://www.uwa.edu.au/study/-/media/Faculties/Science/Docs/Features-of-the-honey-possum.pdf

https://link.springer.com/article/10.1007/s00360-011-0632-9

https://link.springer.com/article/10.1007/s003600050257

https://www.bushheritage.org.au/species/honey-possum

Round 5 - Egg Substitute

https://nordicfoodlab.wordpress.com/2014/01/07/2013-9-blood-and-egg/#_ftn4

https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/albumin

https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/egg-albumen

[Ask the Science Couch]

Blood donation, IVs, & venepuncture

https://www.fi.edu/heart/blood-vessels

https://www.ncbi.nlm.nih.gov/books/NBK138671/

https://www.sciencedirect.com/topics/neuroscience/median-cubital-vein

https://www.ahajournals.org/doi/pdf/10.1161/01.res.22.6.737

https://www.mountsinai.org/health-library/tests/arterial-stick

https://www.ncbi.nlm.nih.gov/books/NBK138661/

https://pressbooks.bccampus.ca/clinicalproceduresforsaferpatientcaretrubscn/chapter/8-6-infusing-iv-fluids-by-gravity-or-an-electronic-infusion-device-pump/

[Butt One More Thing]

Snakes and cloacal autohemorrhaging 

https://www.floridamuseum.ufl.edu/florida-snake-id/snake/eastern-hog-nosed-snake/

https://www.sciencedirect.com/sdfe/pdf/download/eid/3-s2.0-B9780323482530001719/first-page-pdf

https://www.cresosnake.com/kingsnakes