Diamond is the harder substance known to occur in nature and is pure carbon, packed in a cubic molecular structure.

Because astronomers know how bright some stars truly are, they can measure its distance from us by analyzing how dim they appear 

Experts agree when permanently changing eating and exercise habits rather than just dieting for brief periods is the key to controlling weight.

Because of their specialized diets, in many parts of the world, orca, commonly known as killer whales, prey on either fish and marine mammals, but not both.

If a person does not have an attorney, the court ........................ one.

Doctors have concluded that in addition to regular exercise, a diet rich in ................... is good for the heart.

Writers such as Poe and Brontë felt more free to expression emotions in their writing that did authors like Dickens and Austen.

The average spoken sentence in conversational English takes 2.5 seconds .................................

Election results came in from Eastern Washington quite rapid, but the tallies from Seattle were announced even quicker.

The question of whether there are intelligent beings living on another planets has been posted by scientists since the discovery of other planets hundreds of years ago.