Cryptography involves creating (and cracking) secret codes to hide messages. It's been called the art of hiding information—and so a cryptographer is perhaps the opposite of a librarian.
Try your hand at the simple cryptogram below. Each letter in this quotation is replaced with another. To get you started, O is replaced by H.
Check back tomorrow for the answer!
DH YTT Y ILVGYGA DH Y OHCES LE DH RLBS DOYD OHCES Y EHCI
(Photo of a coding machine from the US National Cryptologic Museum taken from Wikimedia Commons.)