Charles Lindbergh - a quiz

Find what is missing from the following text:

What do you know about Charles Lindbergh?

You probably know he was an American aviator. He achieved overnight world stardom when he became the first person to fly non-stop across the Atlantic, solo, in 1927.

You might also know that Lindbergh was strongly opposed to American involvement in World War II - until Pearl Harbor, after which he volunteered to fly combat missions in the Pacific.

And you might know that in later life he became a prolific author, an explorer and an environmentalist.

But did you know that he was also a machine-obsessed inventor, who entered into a macabre alliance with a French-born surgeon to try to achieve immortality?

The answer here.