Trace Dominguez joins the show to explain just how inconceivable building up an immunity to iocane powder (or other poisons) is. Sara Kiley also discusses unidentified seismic objects, and Rachel talks about how peeing together transcends species. The Weirdest Thing I Learned This Week is a podcast by Popular Science. Share your weirdest facts and stories with us in our Facebook group or tweet at us! Click here to learn more about all of our stories! Links to Rachel's TikTok, Newsletter, Merch Store and More: https://linktr.ee/RachelFeltman Rachel now has a Patreon, too! Follow her for exclusive bonus content: https://www.patreon.com/RachelFeltman Link to Jess' Twitch: https://www.twitch.tv/jesscapricorn -- Follow our team on Twitter Rachel Feltman: www.twitter.com/RachelFeltman Produced by Jess Boddy: www.twitter.com/JessicaBoddy Popular Science: www.twitter.com/PopSci Theme music by Billy Cadden: https://open.spotify.com/artist/6LqT4DCuAXlBzX8XlNy4Wq?si=5VF2r2XiQoGepRsMTBsDAQ Thanks to our Sponsors! Get Started today at https://chime.com/WEIRDEST. Chime. Feels like progress. Give yourself the luxury you deserve with Quince! Go to https://Quince.com/weirdest for free shipping on your order and 365-day returns. Stop putting off those doctors appointments and go to https://www.Zocdoc.com/WEIRDEST to find and instantly book a top-rated doctor today. Learn more about your ad choices. Visit podcastchoices.com/adchoices