Uploaded October 2023 | Updated September 2026, 2 weeks ago

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Hosted by: Jessi Knudsen Castañeda (she/her/they/them)
Kaitie Janecke Soltesz: Writer
Kyle Nackers: Fact Checker
JD Voyek: Script Editor
Madison Lynn: Videographer
Sam Schultz: Script Supervisor
Stefan Chin: Editor
Josef "Tuna" Metesh: Sound Designer
Aimee Roberts: Art Director/Puppeteer
Daniel Comiskey: Editorial Director
Savannah Geary: Producer
Nicole Sweeney: Executive Producer
Hank Green: Executive Producer

Sources:
kidshealth.org/en/kids/blood.html
health.clevelandclinic.org/what-color-is-blood
acs.org/content/dam/acsorg/education/resources/highschool/chemmatters/issues/best-of-chemmatters/sample-lesson-plan-the-many-colors-of-blood.pdf

Images:
gettyimages.com/detail/photo/phlebotomy-biochemical-analysis-laboratory-exam-and-royalty-free-image/1154579748?phrase=human+blood+vial&adppopup=true
gettyimages.com/detail/photo/red-blood-cells-and-white-blood-cells-leukocytes-royalty-free-image/1394766732?phrase=red+vein&adppopup=true
gettyimages.com/detail/illustration/red-blood-cell-and-hemoglobin-vector-heme-royalty-free-illustration/1458687162?phrase=hemoglobin&adppopup=true
gettyimages.com/detail/photo/close-up-blood-bag-in-laboratory-medical-concept-royalty-free-image/955502676?phrase=human+blood+&adppopup=true
commons.wikimedia.org/wiki/File:Venous_and_arterial_blood.jpg