__ heated by solar energy have special collectors on the roofs to trap sunlight.

Each number in a binary system are formed from only two symbols.

Scientists at the medical center is trying to determine if there is a relationship between saccharine and cancer.

On the rim of the Kilauea volcano in the Hawaiian Islands are a hotel called the Volcano Hotel.

The great digital advances of the electronic age, such as integrated circuitry and a microcomputer, has been planted in tiny chips.

There are many frequently mentioned reasons why one out of four arrests involve a juvenile.

Kepler's Laws, principles outlining planetary movement, was formulated based on observations made without a telescope.

Only with a two-thirds vote by both houses are the U.S. Congress able to override a presidential veto.

Of all the evidence that has piled up since Webster's paper was published, there is no new ideas to contradict his original theory.