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Listener Pedro wants to know: are real-life roadrunners as fast as their cartoon counterparts? Roadrunner researcher Tina Guo gets us up to speed on this avian escape artist and the special feet-ure that makes these birds hard to track. Learn more about your ad choices. Visit podcastchoices.com/adchoices

We’ve dug up one of our favorite episodes this week: Caller Hank wants to know where the sand on his central California beach came from. Beach buff Kiki Patsch gives us the surprising scoop on how beaches are born. Special thanks to Gary Griggs. Learn more about your ad choices. Visit podcastchoices.com/adchoices

While Flora’s out, we’re revisiting an old favorite — caller Megan’s cat has zero empathy and tries to trip her on the stairs. Could he be a psychopath? Jon Ronson, author of The Psychopath Test, and cat psychologist Eva Waiblinger help Megan assess if she's got a killer just a whisker's length away. Learn more about your ad choices. Visit podcastchoices.com/adchoices

Caller Hank wants to know where the sand on his central California beach came from. ELT gets the surprising scoop on how beaches are born. Guest: Kiki Patsch, California State University Channel Islands. Special thanks to Gary Griggs. Learn more about your ad choices. Visit podcastchoices.com/adchoices