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.

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While Flora’s away, we’re shining a light on some of our favorite episodes. Listener Erik saw a mysterious glow in the water during a trip to the beach, and he wants to know more. ELT talks to the “Jacques Cousteau of glow,” a scientist who has spent decades deep diving for answers. Guest: biologist and ocean researcher Edie Widder. Thanks to Eelke Dekker for the seagull and ocean sounds we used in this episode. Thanks also to Steven Haddock, Michael Latz, Matt Davis, Vincent Pieribone, and Severine Martini.

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Caller Makaila needs to know about the hummingbirds that frequent her father’s feeders. Hummingbird expert Alejandro Rico-Guevara fills us in on their feeding, flying, and fighting feats. Photo credit: Kristiina Hurme

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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.

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While Flora's out on parental leave, we're unswaddling some of her favorite babies. Favorite podcast babies. Like this one: Caller Lisa wants to know why her butt hurts whenever she sees someone else get injured. Neuroscientist Stuart Derbyshire shares the cold hard truth about whether some people really can feel your pain. Thanks to queen of Chapped Cheeks Lisa, and to researchers Natalie Bowling, Melita Giummarra, Helena Hartmann, Marina López-Solà, Bridget Rubenking, Jamie Ward, Scott Vrana, and Jamil Zaki.

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Caller Liz has a cherished childhood memory about a special meal with her great-grandmother. But she isn’t sure it really happened. How can she tell? Memory researcher Charan Ranganath, director of the Dynamic Memory Lab, fills in the blanks about the memory in question.

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Listener Gĩtaũ has a serious problem: every so often his home in rural Kenya is invaded by an army of ants. They coat the floors, climb the walls, and rain down on Gĩtaũ and his family while they sleep. Gĩtaũ wants to know: Why are these ants torturing us? Entomologists Dino Martins and Piotr Naskrecki have ant-swers. Special thanks to Caswell Munyai, Caspar Schöning, and Daniel Kronauer.

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Flora has a 6- to 9-pound piece of news to drop! She’ll be out on parental leave for a little while. Meet the hosts who’ll be filling in while she’s away.

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Terriers have won Best in Show at the Westminster Kennel Club dog show 48 times. Dachshunds? Never. Listener Yona wants to know why terriers triumph but dachshunds don’t get their due. Dog show judge Laurie Williams and dachshund-diehard Kim McCalmont take us behind the scenes of the dog show world.

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