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Internal combustion engines have byproducts called emissions. These byproducts are either particulates or gaseous chemicals. Emissions travel from the engine via an exhaust system, which is a system of pipes that leads the emission away from the combustion source.

A crush is a feeling of infatuation, love, romance, or lust towards another. Crushes are usually considered to be more superficial and short-term than romantic love, but certainly can develop into more complex emotions. Having a crush is often an important step in the emotional development of an adolescent.

The Black Eyed Peas is an American hip hop musical group that is composed of will.i.am, apl.de.ap, Taboo, and Fergie.

Includes questions related to generating electricity through the use of naturally occuring heat sources.

Tremaine Aldon Neverson, better known as Trey Songz, is an American actor and recording artist. He has released three albums; one that reached #3 on the Billboard Top 200.

Cognitive development focuses on a child's mental development. This includes language learning, information processing, reasoning and problem solving, and other related issues. Jean Piaget was very influential in the field of cognitive development. Her theory on schemas helped to shape the study.

Although many people fear them, snakes are a popular pet and be quite tame with proper care. Ask questions here about the habitat, diet and behavior of pet snakes.

Percocet and Percodan are narcotic pain relievers, similar to morphine. Manufactured by Endo Pharmaceuticals, both drugs are used to treat moderate to acute severe pain that is neither chronic nor breakthrough.

An infamous terrorist, Osama bin Laden was the mastermind behind the September 11, 2001 attacks on the United States. It was announced ten years later on May 1, 2011 that he was killed.

The E-350 is a full-size van produced by the American automaker Ford Motor Company for its E-Series or Econoline product line. This heavy duty passenger van is frequently used as school bus, ambulance and commercial van.

Depo-Provera is an injectable contraceptive product which is administered every three months. Manufactured by Pfizer Inc., the product prevents the ovaries from producing eggs. It is a highly effective contraceptive method with a success rate of 99.7%.

A fork lift is a vehicle used for lifting and moving heavy objects. A good example of how a forklift is used can be found at grocery warehouses. Large palettes of products are pulled from the shelves, and a forklift is used to move them to lift and load them onto the trucks for delivery.

A genus of lizard, iguanas are native to tropical areas of South and Central America and the Caribbean. This genus has two species: the Lesser Antillean Iguana and the Green Iguana. Iguanas have a dewlap and a third ‘eye’ on their head.

File sharing is the term given to any method people use by people to share programs and other files between one another. Questions about file sharing programs and protocols belong here.

The sport that is known as Athletics to the International Olympic Committee, Track and Field has been an Olympic sport since the very first Olympic Games in 776 BC.

A machine for generating compressed air, typically for use by air-powered tools or paint sprayers. The compressor takes in air at atmospheric pressure, and increases it to any pressure between 1 psi above atmospheric, and 10,000 psi above atmospheric. Air compressor motors can range from fractions of a horsepower, to multiple thousands of horsepower.

Assassination is the act of murdering a well-known figure by surprise attack.

The Chicago Bulls are an American professional basketball team playing in the National Basketball Association (NBA). Winning six championship titles during the 1990s, the Bulls are believed to have one of the greatest dynasties in sports and NBA history.

Includes questions related the use of the sames sounds or consonants at the beginning of words or repetition of similar sounding vowels or consonants.

Spider-Man was a great movie, and there are many video games out there. These games include Spider Man Ultimate, Spider-Man 1, 2, and 3, etc. You will find cheats, questions, and a lot of WikiAnswers in this category.

The largest city in Scotland, Glasgow is located on the River Clyde and home to 1.2 million people. Glasgow is a major business center for the UK and Europe.

Red Dead Redemption is a Western-themed video game released in May 2010 for the PlayStation 3 and Xbox 360.

The chinchilla is a small creature which is primarily farmed for its fur. All questions concerning the care and feeding of this animal can be directed here.

Windmills are machines used to convert wind energy into other usable forms. They are commonly used for the pumping of water or milling of grains.

Webcams are cameras designed to be easily connected or built into a computer and enable people to see you while you are chatting.

Located in Australia, the Great Barrier Reef is the world's largest reef and encompasses an area of 133,000 square miles.

Questions about tooth repair or replacement in the specific areas of dentures, fillings, and crowns.

Lemon juice is the liquid from crushing lemons. It is used as flavoring in many food and drink recipes and in adding acid to canned foods. Lime juice is the juice of freshly crushed limes. It is used as flavoring in many foods and drinks.

The Lincoln Continental was a front-drive luxury vehicle manufactured by Ford Motors between 1939 and 1948, and from 1956 to 2002. Powered by a V8 engine, its main competitor was the Cadillac DeVille.

Brass instruments are lip-vibrated instruments (labrosones). Here you can ask questions about the different types of brass instruments, methods of cleaning them, etc.