As part of a neurological experiment this afternoon I underwent an MRI scan. (See here.)
It was less claustrophobic than I thought it would be. No tumors were found in my brain -- the scientists were helpful and very friendly.
In the near future a 3-d printer will print my brain. Perhaps one day the 3-d printer will be able to print a perfect clone: Arnon 2.0.
Then I will be able to take some rest.