Carl opened one of the things from Nell's blood and found a rod logic 
system inside, and a tape drive containing some few gigabytes of data. The data 
was divided into discrete chunks, each one of which was separately encrypted. 
Carl tried all of the keys that he had obtained from John Percival Hackworth 
and found that one of them—Hackworth's key—unlocked some of the 
chunks. When he examined the decrypted contents, he discovered fragments of a 
plan for some kind of nanotechnological device.