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What's up with the mysterious signals panda Mei Xiang is sending scientists at the National Zoo? Could she actually have a bun in the oven? In a follow-up to his February story, WAMU environment reporter Sabri Ben-Achour heads back to the Zoo, and brings us this update on Panda Pregnancy Watch 2011.
[Music: "Sexx Laws" by Dr. Lonnie Smith from Boogaloo to Beck]