palindromic C programs

[John Gilmore]

The ultimate here would of course be a program which could take
another program as input and produce a third program which at random
would be either a modified version of itself, or a modified version
of the program it read as input.  Of course, once in a while an alpha
particle will introduce a small change in the program.  It's a good
thing there are lots of small systems without parity, else evolution
would proceed much more slowly.