TWiM explains a bacterial antiviral defense system that uses a noncoding RNA template to build tandem-repeat DNA through a mechanism that parallels how eukaryotic telomerase extends telomeres, and genome sequencing of the Tsimane of Bolivia and the Hadza of Tanzania which reveals over a thousand gut bacterial species shared between the two populations, many now vanishing from industrialized humans, suggesting they co-migrated with our ancestors out of Africa and into the Americas.

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Music used on TWiM is composed and performed by Ronald Jenkees and used with permission.

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