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

Each number's 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.