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How Do We Know How Old the Earth Is?

In the wake of World War 2, Clair Patterson embarked on a scientific quest to find out how old the Earth really is. His hard work paid off, but it also revealed a modern danger. Hosted by: Reid Reimers ---------- Support SciShow by becoming a patron on Patreon:   / 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:   / scishow   Twitter:   / scishow   Instagram:   / thescishow   Facebook:   / scishow   #SciShow #science #education #learning #complexly ---------- Sources https://www.geolsoc.org.uk/Geoscienti... https://www.americanscientist.org/art... https://www.mentalfloss.com/article/9... https://www.ucl.ac.uk/~ucfbpve/geotop... https://www.sciencedirect.com/science... https://www.sciencedirect.com/science... https://oralhistories.library.caltech... https://www.nasonline.org/publication... https://web.archive.org/web/201106030... https://www.ucl.ac.uk/~ucfbpve/geotop... https://www.ncbi.nlm.nih.gov/pmc/arti... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://en.wikipedia.org/wiki/File:Bu... https://en.wikipedia.org/wiki/File:Si... https://commons.wikimedia.org/wiki/Fi... https://www.nps.gov/subjects/geology/... https://commons.wikimedia.org/wiki/Fi... https://en.wikipedia.org/wiki/File:Tr... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://en.wikipedia.org/wiki/File:Me... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://commons.wikimedia.org/wiki/Fi... https://www.phy.anl.gov/fma/#:~:text=... https://en.wikipedia.org/wiki/File:De... https://en.wikipedia.org/wiki/File:Gr... https://commons.wikimedia.org/wiki/Fi...