Fix spelling of "copy"

chap8.tex

@@ -850,7 +850,7 @@ \subsection{Splitting the atom}
 He idly stabbed at his leg with a pen whilst waiting for John to finish his tapping away.
 
 John lifted his keys from the keyboard and turned his chair.
-``You really can't think of a way to coopy what we have in one repo into another?''
+``You really can't think of a way to copy what we have in one repo into another?''
 
 Suddenly it was like a light bulb had exploded with light inside Jack's skull.  "CLONES!" he shouted.
 \end{trenches}