Addictive drugs are known as narcotics.

Argentina is a leading producer of beef.

The liquid in the semicircular canals in your inner ear give you your sense of balance.

The sensory receptors in your nose are called the olfactory receptors.

Conjunctivitis is caused by an infection of the conjunctiva (the membrane that covers the front of the eye).

Dark eyes are less sensitive to light than light-colored eyes because the darker the iris, the less light passes through.

Brazil's original capital was in Rio de Janeiro, but it is now in Brasilia.

Lake Maracaibo is the largest lake in South America.

There is estimated to be about one billion of a certain 1 foot long species of frog living on the bottom of Lake Titicaca.

America is named after the explorer Amerigo Vespucci.