Basic
Binary
https://www.youtube.com/watch?time_continue=137&v=ewokFOSxabs
https://www.youtube.com/watch?v=Xpk67YzOn5w
http://betterexplained.com/articles/starting-ruby-on-rails-what-i-wish-i-knew/
Rube Goldberg machine
http://betterexplained.com/articles/combining-simplicity-and-complexity/