Doctor Who’s Time Lords Have Two Hearts. Here’s How Their Dual Cardiac System Could Work
A Doctor Who superfan explains how the unusual cardiovascular system of the alien Time Lords could evolve and function
![Doctor Who’s Time Lords Have Two Hearts. Here’s How Their Dual Cardiac System Could Work](https://static.scientificamerican.com/dam/m/40677525a63861a0/original/2WGGPH1-lead.jpg?w=1200)
A Doctor Who superfan explains how the unusual cardiovascular system of the alien Time Lords could evolve and function
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