The gang decides to revisit the past by returning to a few previous podcast topics and updating them with current research; starting with a survey of recent research into early vertebrate jaws. And like a snake eating its own tail, the conversation rambles about in circles and accomplishes very little. At the very least they manage to deliver an empathetic discussion of the impostor syndrome, seemingly for no reason. Meanwhile, Curt details teddy bear vivisection, James mixes pseudoephedrine and alcohol, and Amanda learns about the importance of eating before drinking.
 
References
Pradel, Alan, et al. "A Palaeozoic shark with osteichthyan-like branchial arches." Nature (2014).
Giles, Sam, Matt Friedman, and Martin D. Brazeau. "Osteichthyan-like cranial conditions in an Early Devonian stem gnathostome." Nature (2015).