lecture03: Revision: Probability Theory

• http://xkcd.com/221/
• http://en.wikipedia.org/wiki/Letter_frequency
• http://en.wikipedia.org/wiki/File:English_letter_frequency_(alphabetic).svg
• http://www.learnmorsecode.com/
• http://www.wikihow.com/Learn-Morse-Code
• http://www.justlearnmorsecode.com/