Sulfa drugs prevent bacteria from multiplying.

The harp has 47 strings.

The trombone was originally known as the sackbut, which comes from the French term saquebute, a type of lance with a hook.

The pipe organ was invented by Ctesibius, a third century B.C. engineer from Alexandria, Egypt.

Glockenspiel (the name of a certain percussion instrument) means "play bells" in German.

If a standard trumpet's tube was unwound, it would be about 4 1/2 feet long. 3

Stimulants are substances which speed up the rate of the body's activities, while depressants are substances which slow them down.

Marijuana is the most frequently used illegal drug.

The alcohol in alcoholic beverages is a colorless liquid called ethanol or ethyl alchohol.

A carcinogen is a substance that causes cancer.

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.

The cerebellum controls your body's balance.

South America is home to almost one-fourth of all known animals.

The largest South American mammal is the tapir.

Your spleen is part of the lymphatic system.

Skin is the largest organ of the human body.

The bee hummingbird is the smallest bird in the world.

Cuba is the first Communist government in the Western Hemisphere.

Grenada has a leading world role in the production of nutmeg and other spices.

The Dominican Republic is the most mountainous country in the West Indies.

Hispaniola is the second largest island in the West Indies.

Sugar is the main product of the West Indies.

Isabela was the first European city in the Americas.

Honduras is the poorest country in Central America.

Lake Nicaragua is the largest lake in Central America.

Mexico is the world leader in the mining and producing of silver.

The first President to be impeached was Andrew Johnson in 1868.

Mexico City stands on the site of Tenochtitlan.

During the 2000 election, both Al Gore and George W. Bush needed Florida to have the majority of votes. Bush's win margin was so slim that for 36 days, several precincts recounted their votes.

William J. Clinton was the second American president to be impeached.

Latvia, Lithuania, and Estonia originally made up the Baltic Republics.

The large artery in your upper arm is the brachial artery.

Sandra Day 'OConnor was the first woman justice ever appointed to the Supreme Court.

Alan B. Shepard Jr. was the first American to fly in space.

J.C Watts Jr. was the first black American Republican to win a seat in the House of Representatives since shortly after the Civil War.

Jackie Robinson was the first black major league baseball player.

Poison ivy and poison oak are easily recognizable by their groups of three leaves.

Douglas MacArthur's father's name was Arthur MacArthur.

You should swim parallel to the shore rather than away from it.

Chiang Kai-shek was leader of China during World War II.

After World War II, the countries China, Great Britain, the Soviet Union, and the United States were known as the Big Four.

The area of a circle is found by using the formula Pi x radius².

Germany's attack on Poland started World War II.

The emperor of Japan before World War II was Hirohito.

Charged atoms are called ions.

The Panama Canal was opened in 1914.

Combustion is the chemical process that occurs when a substance reacts rapidly with oxygen.

Those Christians who believe in the fundamental truths of Christianity are know as Fundamentalists.

Robert Boyle laid the foundations for chemistry.

Theodore Roosevelt was the United States of America's 26th President.

Oxygen, hydrogen, nitrogen, neon, krypton, and argon are all noble gases, gases which do not usually combine with other elements.

Silicon is a semimetal element that is used to make computer chips.

Mercury is the only metal that is liquid at room temperature.

A carbon atom has six protons, six neutrons, and six electrons.

Osmium is the densest element.

Garrett A. Morgan invented the traffic light.

Weight is a measure of the pull of gravity on an object.

Neptune has the fastest winds recorded in the solar system.

Cyrus McCormick invented a mechanical reaper.

Pluto also rotates on its side.

Uranus, its rings, and fifteen of its moons rotate on their sides.

Saturn's largest moon, Titan, has it's own atmosphere.

General Robert E. Lee surrendered at Appomattox Court House, Virginia.

The first battle of the Civil War was won by the South at Fort Sumter.

South Carolina was the first state to leave the Union.

Eli Whitney invented the cotton gin.

The space shuttle was the first spacecraft designed to be reused.

Salyut 1 was the first space station.

Jonathan Goble was the first Baptist missionary to Japan.

The first American in space was Alan Shepard.

California was the thirty-first state to join the union.

Robert H. Goddard launched the first liquid-fuel rocket.

Another kind of telescope is the radio telescope, which receives radio signals from outer space that help it create stellar maps and images.

There are two kinds of telescopes: reflecting telescopes and refracting telescopes. The first uses mirrors, while the latter uses lenses.

Light travels at 186,000 miles per second.

Noah Webster wrote the first major American dictionary.