Look closely at a map of Oakland and you'll notice an odd spot that seems to have been cut out. That's the city of Piedmont. Bay Curious listener David Levine wanted to know how and why Piedmont came to be separate. And he's curious about how that history has affected the relationship between the two places. KQED's Chris Hambrick went to find out. This episode first aired in 2019, but we still get questions about it on the regular.

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This story was reported by Katherine Monahan. This episode of Bay Curious was made by Olivia Allen-Price, Bianca Taylor, Katrina Schwartz and Christopher Beale. Additional support from Jen Chien, Katie Sprenger, Cesar Saldana, Maha Sanad and Holly Kernan.