Know how to drive safely when it's raining or when it's snowing. The two conditions are different.

Know the official post office abbreviations for all 50 states without having to consult a list.

Know how and how much to tip people who expect gratuities, even in the case of poor service.

If you're wondering if you're dreaming, you're dreaming.

You're who you think you are, even if you never admit it to yourself or to anyone else. You may be in the worst position to judge, but you're in the best position to know.

The magnitude of an action may change not only the strength of its impact, but the direction. If you became a dentist, for example, you would certainly be an asset to our society. But what if everyone became a dentist? Who would bake the bread? Who would build the houses?

Know which officials are voted into office and which are appointed, and by whom.