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Well regarded cardiac surgeon Barratt-Boyes supposedly had a brother who was a good plumber.

This always made me happy.

https://en.wikipedia.org/wiki/Brian_Barratt-Boyes

Oddly enough my department done work into heart replacement valves - the fluid mechanic element of blood flows as a non-newtonian fluid matched a lot of chemical plant calculations. The labs had lots of heart valves and simulators lying around

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