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Barcodes, and the laser scanners that read them, make it possible to keep track of millions of packages, groceries and railroad cars. New uses are continually being added. Questions and answers about the uses, history and technology of bar codes belong here.

Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), better known by the pen name Mark Twain, was an American author and humorist. He is most noted for his novels Adventures of Huckleberry Finn, which has since been called the Great American Novel.

Consuming products that are environmentally-friendly. These include products that do not produce CFC's and do not harm the ozone layer.

Japanese multinational automaker Nissan Motor Company, Ltd is one of the world’s biggest car manufacturers. It produces luxury models under the brand Infiniti in addition to its normal range of models.

The Sun is the star at the center of our solar system. It provides our planet with light, warmth, and energy.

A driver's license permits a person to drive a vehicle. Most US States allow 16-year-olds to test for, and obtain, a driver's license. Licenses must be renewed periodically. Licenses also serve as identification.

Situated in the Midwest and flanked to the east by Lake Michigan and Lake Superior to the north, Wisconsin is known as "America's dairyland", leading the nation in cheese production.

The Master of Business Administration (MBA) is a master’s degree in business administration. The core courses in the MBA program aim to introduce students to the different areas of business like accounting, marketing, finance, human resources and operations management.

pH levels are the measure of activity of hydrogen.

The existence of life beyond earth is strictly theoretical. Whether you consider them friendly visitors, aggressive invaders, or just characters in a science fiction novel or film, ask your questions about our space neighbors here.

Includes questions about any kind of poker. Questions exclusively about video game poker should go in video games, but can be placed here as a second category.

Hades is the god of the underworld in Greek mythology. Hades, along with his brothers Poseidon and Zeus, defeated the Titans and claimed rulership over the underworld sea and air.

Gift giving is spontaneous but oddly expected especially when there is an occasion. It is an expression of happiness coming from the person giving. Gifts are also meant as a form of kindness and forgiveness.

Includes questions about the use of expressions to refer one thing to another. Metaphors are comparisons without the use of the words "like" or "as". Ex: All the world's a stage. Metonymy shows association between two concepts. Ex: The press was banned from the room. (Press, meaning reporters.) Synechdoche is a part or a whole concept described by a single body part. Ex: All hands on deck.

Bin Weevils is an online gaming and virtual pet site, aimed at younger users.

Questions here can be about buying and selling new or used cars and motorcycles. Subcategories include how to obtain car loans and titles, and specific inquiries about cars and motorcycles.

This category is for questions about the author Theodor Geisel, better known as <a href="http://www.answers.com/main/ntquery?s=dr suess ">Dr. Seuss</a>. He is the author of many beloved children's books. Some of his titles include Green Eggs and Ham, The Cat in the Hat, and The Grinch That Stole Christmas.

Various forms used by the IRS in conjunction with income taxes such as W-2, W-4, W-9, 1040, 1098, and 1099

Comets are small solar system bodies that orbit around the Sun. They have a tail (trail of light) when traveling in space.

This category is for questions about the book written by Ellen Raskin. <a href="http://www.answers.com/topic/the-westing-game">"The Westing Game"</a> won the Newberry medal in 1979.

This category is for questions and answers about the Mario Kart video game. You can play as Mario in races made by Nintendo.

The plant-eating hippopotamus is the third-largest land mammal by weight and is often regarded as the most ferocious animal in Africa.

This category is for questions about the various vessels by which lymph, a watery fluid of leukocytes, circulates through the body, providing transportation for some materials and removing particulate from tissues.

What time is it? It's a common question people who wear wristwatches get. Ask questions about brands, styles and repairs here.

Beginning after the annexation of Texas in 1845, this lasted about two years from 1846-1848. Many of the Civil War Generals gained combat experience in the engagements that eventually drew the Border between the US and Mexico.

Neopets is a virtual pet website owned by Viacom. Users on the site can take care of pets by buying them food, clothing and accessories with virtual Neocash.

Questions about the sport of skiing, how to take care of skis, and different competitive skiing events.

Born Joseph Vissarionovich Stalin (1878 – 1953), Stalin was the first General Secretary of the Central Committee of the Communist Party of the Soviet Union from 1922 until his death. He assumed a lead role in Soviet politics following the death of Vladimir Lenin in 1924.

A serpentine belt is a single, continuous belt utilized in driving devices – such as power steering pump, alternator and others – in an automotive engine. First used by Mercedes-Benz, the belt is more efficient than the older multiple belt system.

This category is for questions about the field of Biology that ties together the environment and its inhabitants in order to better understand the world we live in.