The Evolution of the Heart (A Love Story)

Thanks to Google's Science Journal app for supporting PBS. Learn more at https://g.co/sciencejournal PBS Member Stations rely on viewers like you. To support your local station, go to http://to.pbs.org/DonateEons In order to understand where hearts came from, we have to go back to the earliest common ancestor of everything that has a heart. It took hundreds of millions of years, and countless different iterations of the same basic structure to lead to the heart that you have today. Thanks as always to Nobu Tamura for allowing us to use his wonderful paleoart: http://spinops.blogspot.com/ Thanks to Ceri Thomas for the Ichthyostega reconstruction. Check out more of Ceri's paleoart at   / alphynix   and http://nixillustration.com Produced for PBS Digital Studios. Super special thanks to the following Patreon patrons for helping make Eons possible: Katie Fichtner, Anthony Callaghan, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, سلطان الخليفي, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Colin Sylvester, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan If you'd like to support the channel, head over to   / eons   and pledge for some cool rewards! Want to follow Eons elsewhere on the internet? Facebook -   / eonsshow   Twitter -   / eonsshow   Instagram -   / eonsshow   References: https://www.ncbi.nlm.nih.gov/pmc/arti... https://link.springer.com/article/10.... https://www.ncbi.nlm.nih.gov/pmc/arti... https://onlinelibrary.wiley.com/doi/a... https://www.ncbi.nlm.nih.gov/pmc/arti... https://www.nature.com/articles/ncomm... http://www.nhm.ac.uk/discover/news/20... http://www.sci-news.com/paleontology/... https://journals.plos.org/plosone/art... https://www.ncbi.nlm.nih.gov/pubmed/7... https://www.ncbi.nlm.nih.gov/pubmed/1... https://genent.cals.ncsu.edu/bug-byte... https://onlinelibrary.wiley.com/doi/f... http://www.fossilmuseum.net/Fossil_Si... http://www.tulane.edu/~bfleury/divers... https://academic.oup.com/mollus/artic... https://circsystems.weebly.com/mollus... https://www.britannica.com/animal/mol... https://onlinelibrary.wiley.com/doi/f... https://www.thoughtco.com/evolution-o... https://www.sciencedirect.com/science... https://www.ncbi.nlm.nih.gov/pmc/arti... https://www.ncbi.nlm.nih.gov/pubmed/2...