Annalee Newitz returns to the show to discuss the cutest little food delivery robots you've ever seen. Plus, Rachel talks self-medicating apes, and Amanda explains why we love our pets' stink and our lovers' smelly armpits. 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! Right now, get 60% off at https://Babbel.com/WEIRDEST This episode is sponsored by BetterHelp. Get 10% off your first month at https://BetterHelp.com/WEIRDEST Ask for Claritin-D at your local pharmacy counter. You don’t even need a prescription! Go to https://Claritin.com right now for a discount so you can Live Claritin Clear Learn more about your ad choices. Visit podcastchoices.com/adchoices