Two factor authentication

Two factor authentication: something you know + something you have.
Apple is now offering this for your Apple ID here!

This is a must IMO for everyone who wants to protect their devices and data.

Google & Facebook also offer these services:

Google         Facebook

Also check your banks & credit unions. They have been doing this for a whiles on the back end for employees with RSA tokens. Most now have some form of two factor authentication with an app or email of a one time code.

Stanford is offering free online classes

Knowledge is the most valuable commodity and when classes are offered for free their value approaches infinity.
Free Crypto class
Free Engineering Classes