Be able to draw an illustration as least well enough to get your point across to another person.

A friend is someone who stays by your side all through the troubles he's caused you.

Almost all of the finer things in life are free or nearly free. You don't have to pay for the sky at night or snow in the morning or a kiss on the nose when you're sick. Forgetting that may put you at the mercy of those who seek to profit by convincing you to want whatever it is they have to sell.

Know the difference between principles based on right or wrong vs. principles based on personal gain, and consider the basis of your own principles.

Play more than one game at a time. This is a painless way to learn how to do many things at once.

Attention-deficit disorders seem to abound in modern society, and we don't know the cause.

Think of a hypothesis as a card. A theory is a house made of hypotheses.