Although spoken English doesn't obey the rules of written language, a person who doesn't know the rules thoroughly is at a great disadvantage.

While you're writing, you can't concentrate nearly as well on what the speaker is saying.

Know how to behave at a buffet. Take a clean plate for a second helping.

Be able to recognize many of the major constellations and know the stories behind them

Understand why casinos and racetracks stay in business - the gambler always loses over the long term.

Be able to notice all the confusion between fact and opinion that appears in the news

Evolution has long been the target of illogical arguments that use presumption.