Cover the Material--Or Teach Students to Think?.

Generating similar questions isn’t difficult: What if consumption of fresh water were limited to two gallons per person per day? What if everyone, no exceptions, had to serve one year of public service after high school? What if a reliable pocket-size voice stress analyzer indicating when someone isn’t telling the truth cost just $10? What if global warming raised the average temperature in the area in which you live by 4°F?