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Igneous, sedimentary, metamorphic... need I say more? Welcome to SciShow Tangents or, as I like to call it, Rock Talk. Note: The podcast ad for the IMPACT app is unscripted and being recorded live. It may contain some slight differences. Please visit for full details of products and services. Interactive Brokers, LLC member FINRA/SIPC.The projections or other information generated by IMPACT app regarding the likelihood of various investment outcomes are hypothetical in nature, do not reflect actual investment results and are not guarantees of future results. Please note that results may vary with use of the tool over time.The paid ad host experiences and testimonials within the Podcast may not be representative of the experiences of other customers and are not to be considered guarantees of future performance or success. The opinions provided within the ad belong to the host alone.Head to to find out how you can help support SciShow Tangents, and see all the cool perks you’ll get in return, like bonus episodes and a monthly newsletter!And go to 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[Trivia Question]Stonehenge sarsen vs. Dwayne “The Rock” Johnson[Fact Off]Microgranite used for curling stones bees drilling into sandstone[Ask the Science Couch]Licking rocks or bone[Butt One More Thing]Limestone-eating and sand-pooping shipworm
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