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Air pollution is the presence of natural and artificial substances in the air that affect the health of humans and other organisms. A person continuously exposed to polluted air may eventually develop lung problems.

Snow forms when a water droplet is frozen and becomes a crystal, while ice forms when water is crystallized on a cold surface or when snow melts and freezes again.

Pokémon Black and White are the latest games in the Pokémon franchise for the Nintendo DS system. These games feature new Pokémon as part of the 5th Generation of Pokémon.

As children enter puberty they also develop an interest in the opposite sex. Relationships under the age of 13 can get very complicated and confusing. This category is for questions related to preteen relationships and dating under the age of 13.

The Odyssey is the epic poem written by Homer. In the Odyssey, Odysseus, King of Ithaca and the main character, is on a quest to get home, however he must face many challenges the Gods of Olympus set before him.

London is the capital of England, and the largest metropolitan city in the United Kingdom. It has a total area of 1,572.1 square kilometers (607 square miles), with an estimated population of 7.6 million (as of 2010).

Manufacturing is the use of tools, machines and labor to produce goods for sale or use. It may refer to various human activities ranging from handicraft to high tech, but is most commonly applied to industrial production where raw materials are transformed into finished goods.

Marriage is a social union or legal contract between individuals. It is an institution in which interpersonal relationships, usually intimate and sexual, are acknowledged by a variety of ways, depending on the culture or demographic. Such a union may also be called matrimony.

A tornado or twister is a violent, rotating column of air which typically has a speed ranging from 177 km/h to over 480 km/h. This devastating windstorm is usually characterized by its funnel-shaped cloud that extends toward the ground.

Questions about Chinese people, events, customs and cultures, including the various Chinese dynasties in existence throughout nearly 5000 years of China's history.

The probability of a certain event is a number expressing the likelihood that a specific event will occur, expressed as the ratio of the number of actual occurrences to the number of possible occurrences. In mathematics, it is a measure of how often an event will happen and is the basis of statistics.

Questions pertaining to all camera types, equipment, supplies, techniques, processes, technologies and the history of photography. As well as questions about famous photographers, their work, career opportunities or training. Please note images of specific photographs and critiques of the various works are not part of this category.

Fish are fascinating creatures to watch. Keeping them in an environment that makes it easy for us to observe them is a challenge with many questions. Ask your questions here.

All about the history of basketball. Includes questions about the first game ever played, the history of how basketball was created, and about the most points ever scored in one game.

Anne Frank was a German-Jewish girl living in the Netherlands during German occupation in World War II. She is most famous for her diary, published posthumously, which details the persecution of Jews.

Rabbits have been raised by man for many centuries, both as companions and as a food source. The number of breeds designed specifically for companionship is diverse and growing. Hop into this category to explore the wonderful world of pet rabbits.

The largest city in California which was founded in 1781 and incorporated in 1850

Cattle (also commonly referred to as bovines or cows) are domesticated livestock that are raised for beef and/or milk in almost every corner of the world. Note: Cows are female mature bovines, Bulls are intact male bovines, Steers are castrated male bovines, and Heifers are female bovines that have not calved. Any questions about cows and cattle that are not covered in other cattle categories can be asked and answered here.

Find information, as well as the value of, your baseball cards, baseball memorabilia, and collectibles.

The Dodge Ram is a large pick-up truck produced by Chrysler from 1981 to present. The car, which features a front engine and rear/four-wheel drive, was named “Truck of the Year” three times by the Motor Trend magazine.

Located on the eastern shore of the Mediterranean Sea, Israel is the only Jewish-majority state in the world. It has a total land area of 22,072 sq km with an estimated population of approximately 7.7 million as of 2010.

Questions about hotels such as how to book a room, the top hotels in your area, and related topics.

Selena Gomez is an actress and singer. She is known for her role on Wizards of Waverly Place, and for her appearances in a number of Disney movies and series.

Whether it's a photo of a new baby, a wedding or a day at the beach, cameras help us record and remember life's memories. Ask questions about the camera's history and function here.

Golf is a game that has been played through the ages. Steeped in history and tradition, this game of honor instills key life skills of honesty and integrity. The WikiAnswers Golf category includes information about golfers and golf history, clubs and equipment as well as questions on the rules.

Ever since 1992 when MTV first broadcast The Real World, a show about young adults living together, reality TV programming has exploded in popularity. Ask questions about reality TV shows and stars here.

A fuel filter is a device in the fuel line that blocks rust and dirt particles from the fuel passing through it. Usually found in internal combustion engines, it is usually integrated into cartridges containing a semi-permeable paper barrier.

Google is the most popular search engine in the world. It is a publicly held company based in Mountain View, California, They provides services such as search, email, online mapping, office productivity, cloud storage, social networking, IM/video chat, web browser, mobile and desktop operating systems, broadband internet, payment service, and a suite of mobile devices.

Body piercing is a form of body modification that refers to the act of puncturing or cutting a part of the human body, creating an opening in which jewelery may be worn. Body piercing also refers to the opening in the body that is created by the piercing or cutting.

If you are confused by the wide variety of tools available to maintain your yard, ask for help here regarding a new purchase or how to fix or improve something you already have.