Where our mass comes from

[likethebeer]

This is by a person who posts under the name "Veritasium". It's a good explanation of mass & quarks in ways that I hadn't thought of before:
http://www.youtube.com/watch?v=Ztc6QPNUqls

And an explanation of something he talks about in where our mass comes from: "Empty space is not empty":
http://www.youtube.com/watch?v=J3xLuZNKhlY