I wanted to separate data from programs, because data and instructions are very different.
The X server has to be the biggest program I've ever seen that doesn't do anything for you.
When in doubt, use brute force.
I wanted to have virtual memory, at least as it's coupled with file systems.
A well installed microcode bug will be almost impossible to detect.
FORTRAN was the language of choice for the same reason that three-legged races are popular.