Memory. Joshua Foer: Feats of memory anyone can do. Mnemonic. Knuckle mnemonic for the number of days in each month of the Gregorian Calendar.
Each protruding knuckle represents a 31-day month. A mnemonic (RpE: /nəˈmɒnɨk/,[1] AmE: /nɛˈmɑːnɪk/ the first "m" is silent), or mnemonic device, is any learning technique that aids information retention. Mnemonics aim to translate information into a form that the brain can retain better than its original form. Even the process of merely learning this conversion might already aid in the transfer of information to long-term memory. Mnemonics - Memory Techniques.