# What Rats are REALLY Saying, Cosmic Caffeine, Lamarck was RIGHT?!

An episode of [The Weirdest Thing I Learned This Week](https://invisiblenetwork.ai/podcast/1377843908), 5 Nov 2025, 1 h 04 min.

Audio: https://pdst.fm/e/mgln.ai/e/135/verifi.podscribe.com/rss/p/swap.fm/track/i7NUCPwi3tJP053nG6mP/traffic.megaphone.fm/STU6980949239.mp3?updated=1762317964

Tom Lum joins the show to reveal what rats are ACTUALLY saying to each other. Plus, Rachel talks about the color of the Universe, and Lauren explains one evolutionary exception. 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 Link to all of Jess' content: https://www.jesscapricorn.com/ -- 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 Find your fall staples at Quince. Go to https://Quince.com/weirdest Learn more about your ad choices. Visit podcastchoices.com/adchoices

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