Binary search blew my mind when my CS teacher introduced it to us in high school. Before then it had never clicked that information and numbers had properties that were practically magic if you just thought about them in the right way.

yes, even easier if one uses an editor which can easily out-comment selections aka regions and comes with undo trees and regional undo. ;-)

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!}