Back in 2013, two microbiologists made a terrible discovery. And the US government kept it under lock and key. Join us as we learn about the deadliest substances known to humankind!

Correction: The "hybrid-like structure" that Dr. Susan's group discovered contained regions similar to toxins A1 + F5 (subtypes of toxins A + F). Not A1 + A5, like Jill originally said.  

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