If someone calls you crabby, it’s not a compliment – they’re calling you grumpy, grouchy or snappy. But let’s reconsider this stain on the humble crab’s reputation. Look closely at a crab’s gnarled shell and you’ll see an incredible creature. Today, we bring you two very different crab stories. The first comes from former Radiolab producer Rachael Cusick about a woman who replicated the ocean to breed hermit crabs. Next, how crabs may hold a secret to surviving the chaos of the universe.

Radiolab was created by Jad Abumrad and is edited by Soren Wheeler. Lulu Miller and Latif Nasser are our co-hosts. Dylan Keefe is our director of sound design. Our staff includes: Simon Adler, Jeremy Bloom, Becca Bressler, W. Harry Fortuna, David Gebel, Maria Paz Gutiérrez, Sindhu Gnanasambandan, Matt Kielty, Annie McEwen, Alex Neason, Valentina Powers, Sarah Qari, Sarah Sandbach, Arianne Wack, Pat Walters and Molly Webster. Our fact-checkers are Diane Kelly, Emily Krieger and Natalie Middleton. Production help from Tanya Chawla. Sound mixing by Joe Plourde.

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Support for Terrestrials is provided by the Simons Foundation, the Arthur Vining Davis Foundations, the Kalliopeia Foundation and the John Templeton Foundation.