Lockicking 101     http://www.lockpicking101.com  

Cicada 3301    http://uncovering-cicada.wikia.com/wiki/Uncovering_Cicada_Wiki  ::  Very mysterious and unsolved puzzle by unknown peoples!  "…The puzzles focused heavily on data security, cryptography, and steganography…." - wikipedia

Basic Circuit Bending Article   http://media.virbcdn.com/files/af/22a34aae3db2140f-BasicsofCircuitBending.pdf