Know how to treat frostbite until you can get indoors.
Think of a hypothesis as a card. A theory is a house made of hypotheses.
Know how your representatives stand on major national or state issues.
Know how to drive safely when it's raining or when it's snowing. The two conditions are different.
Understand why casinos and racetracks stay in business - the gambler always loses over the long term.
Know the function of a fuse box and the appearance of a tripped circuit breaker.