I would add the following: "It's something that other people/the government can only take away from you, not give to you." OR Something that anyone would always pay an infinite amount of money to buy. Say water, food or a drug for some disease which will kill you. I think it's fair to say that something for which anyone in the world would give everything he has is something which everyone in the world should have.

Forgot to mention, the Machine Learning course and 15 others will be available in Jan/Feb 2012 at http://jan2012.ml-class.org/ . I'll definitely be taking one or two of them.

I also took the Machine Learning class and completely agree, it was a great course. I have graduated in Computer Engineering around 3 years ago, and these courses are a very good way to learn new stuff after leaving university.