Forget aviation hero. On the side, Lindbergh was a Dr Frankenstein figure, who used his mechanical genius to explore the possibility of conquering death - but only for the select few who were considered "worthy" of living forever.

"Beating death was something he thought about his entire life", says David M Friedman, American author of the new book The Immortalists. "Even as a small child, he couldn't accept that people had to die. He would ask: 'Why do you have to die to get to heaven?'" 

In the 1930s, after his historic flight over the Atlantic, Lindbergh hooked up with Alexis Carrel, a brilliant surgeon born in France but who worked in a laboratory at the Rockefeller Institute in Manhattan. Carrel - who was a mystic as well as a scientist - had already won a Nobel Prize for his pioneering work on the transplantation of blood vessels. But his real dream was a future in which the human body would become, in Friedman's words, "a machine with constantly reparable or replaceable parts".

This is where Lindbergh entered the frame. Carrel hoped that his own scientific nous combined with Lindbergh's machine-making proficiency (Lindbergh had, after all, already helped design a plane that flew non-stop to Paris) would make his fantasy about immortal machine-enabled human beings a reality.

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