A hypothesis is a prediction that can be tested./A prediction that can be tested is a hypothesis.

College textbooks, which are ordered by scholars who know their subject, rarely have errors.

In California, where the wholesale price of electricity has risen 900%, the state's utilities are bankrupt.

Dean Kamen has a new invention, which is a wheelchair that can climb stairs.

The increase in students who apply to college early has made getting in tougher and tougher.

George W. Bush is the first Republican president who has made while males a minority in his cabinet.

Have we entered a brave new world in which women will prove to be more effective leaders than men?

IBM, whose new chips make earring-sized cellphones possible, is investing millions of dollars on chip research.

Geneticists are developing new theories about how humans populated Earth by comparing the DNA of people who live in different places.

Today's elite athletes are recruited specialists, many of whom attend college in order to compete.