Why People Thought "Aliens" Made These Rocks

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Subscribe to the SciShow Rocks Box to receive your own Fairy Stone here! https://complexly.info/rocksbox Every so often, humans stumble across stones that are so bizarre and out of place that they seem like they were put there by something sentient. Are the Martian blueberries signs of life on Mars? Were the Klerksdorp spheres left by aliens? And what the heck are fairy stones?Let's look at three of the strangest rock types out there, what we thought they were, and what they really tell us about our planet's actual geology. Hosted by: Hank Green (he/him) ---------- Support us for $8/month on Patreon and keep SciShow going! https://www.patreon.com/scishow Or support us directly: https://complexly.com/support Join our SciShow email list to get the latest news and highlights: https://mailchi.mp/scishow/email ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Shaji John, Timos Gies, Jon Coffman, Anita, Anne Herrington, Ashley Moquin, yeyette, David Johnston, Cye Stoner, Jp Lynch, Bethany Matthews, Chris Curry, J.V. Rosenbalm, Blood Doctor Kelly, Toyas Dhake, Reed Spilmann, Eric Jensen, Garrett Galloway, Lyndsay Brown, Jeremy Mattern, Chris Mackey, Matt Curls, Friso, Jaap Westera, Jason A Saslow, Adam Brainard, Chris Peters, Piya Shedden, Kevin Knupp, Joseph Ruf, Jacob Puthoff, Kevin Bealer, Steve Gums, Alex Hackman ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: https://scishow-tangents.simplecast.com/ TikTok: https://www.tiktok.com/@scishow Instagram: http://instagram.com/thescishow Facebook: http://www.facebook.com/scishow Bluesky: https://bsky.app/profile/scishow.bsky.social #SciShow #science #education #learning #complexly ---------- Sources: https://docs.google.com/document/d/e/2PACX-1vRjxxEsXMs-S6aKtYrgJygT0OidwTO2UOiOuwiVtNq8BvYpHdyXRjeQFJbBJiQzFvhqwPiONMlqQXa2/pub