SciShow: Are Sharks Really Older Than the North Star?

Teacher or professor: SciShow
Subject: Science
Content of the Lesson: If you've spent enough time on the internet, you may have stumbled upon the fact that sharks are older than Polaris, aka the North Star. But are they really? It turns out the truth is a little more complicated. Hosted by: Reid Reimer (he/him) ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Adam Brainard, Alex Hackman, Ash, Bryan Cloer, charles george, Chris Mackey, Chris Peters, Christoph Schwanke, Christopher R Boucher, Eric Jensen, Harrison Mills, Jaap Westera, Jason A, Saslow, Jeffrey Mckishen, Jeremy Mattern, Kevin Bealer, Matt Curls, Michelle Dove, Piya Shedden, Rizwan Kassim, Sam Lutfi ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: https://scishow-tangents.simplecast.com/ TikTok: https://www.tiktok.com/@scishow Twitter: http://www.twitter.com/scishow Instagram: http://instagram.com/thescishow Facebook: http://www.facebook.com/scishow #SciShow #science #education #learning #complexly ---------- Sources: https://www.nhm.ac.uk/discover/shark-evolution-a-450-million-year-timeline.html https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6790773/ https://agro.icm.edu.pl/agro/element/bwmeta1.element.agro-article-3d071941-22e9-48bd-a930-14bba1296be0 https://iopscience.iop.org/article/10.3847/2515-5172/aad2d0 https://iopscience.iop.org/article/10.3847/1538-4357/aaa3f9/meta https://iopscience.iop.org/article/10.3847/1538-4357/aad410 https://www.aanda.org/articles/aa/pdf/2019/03/aa34211-18.pdf https://www.nhm.ac.uk/discover/shark-evolution-a-450-million-year-timeline.html https://www.aanda.org/articles/aa/pdf/2019/03/aa34703-18.pdf https://www.jstage.jst.go.jp/article/starsandgalaxies/3/0/3_4/_pdf/-char/ja Image Sources: https://www.gettyimages.com/detail/video/social-media-mobile-phone-scrolling-the-media-newspaper-stock-footage/1464507513?adppopup=true https://commons.wikimedia.org/wiki/File:Greenland_shark_profile.jpg https://en.m.wikipedia.org/wiki/File:Phoebodus_teeth.jpg https://rs.figshare.com/articles/journal_contribution/Supplementary_material_from_The_early_elasmobranch_i_Phoebodus_i_phylogenetic_relationships_ecomorphology_and_a_new_time-scale_for_shark_evolution/9885062?backTo=/collections/Supplementary_material_from_The_early_elasmobranch_i_Phoebodus_i_phylogenetic_relationships_ecomorphology_and_a_new_time-scale_for_shark_evolution_/4673138 https://commons.wikimedia.org/wiki/File:Polaris_-_17_April_2017.jpg https://commons.wikimedia.org/wiki/File:Polaris_alpha_ursae_minoris.jpg https://www.gettyimages.com/detail/video/beautiful-night-star-trails-spin-around-north-star-over-stock-footage/496038353?adppopup=true https://en.wikipedia.org/wiki/Polaris#/media/File:Polaris_alpha_ursae_minoris.jpg https://en.wikipedia.org/wiki/Polaris#/media/File:Polaris_system.jpg\ https://commons.wikimedia.org/wiki/File:Polaris_DSS.png https://www.gettyimages.com/detail/video/people-on-shore-looking-through-telescope-stock-footage/857792980?adppopup=true https://en.wikipedia.org/wiki/Gaia_(spacecraft)#/media/File:Maquette_de_Gaia_salon_du_Bourget_2013_DSC_0191.JPG https://www.gettyimages.com/detail/photo/orion-and-canis-minor-constellations-and-sirius-royalty-free-image/1182095141?phrase=sirius%2BA https://www.gettyimages.com/detail/photo/vernier-calliper-and-ruler-royalty-free-image/512523456?adppopup=true https://www.gettyimages.com/detail/photo/the-guiding-star-royalty-free-image/1439505344?adppopup=true https://www.gettyimages.com/detail/video/red-hearts-rising-up-falling-love-sweet-romantic-loop-stock-footage/1277723997?adppopup=true https://www.gettyimages.com/detail/video/deep-ocean-and-huge-group-of-sharks-loop-3d-stock-footage/1011437534?adppopup=true


Click here to view video on YouTube.