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eXtensible Markup Language (XML) is a widely-used computer language for creating and designing pages on the web and for defining other languages with more specialized purposes. XML - Managing Data Exchange provides a detailed description of XML, its origins, its programming, and its uses on the Internet today.

Biology is about all living things, like animals, trees, and other plants.

The Au Jus sandwich, also known as a French Dip sandwich or Roast Beef Au Jus, traces its origin to a restaurant in downtown Los Angeles in 1918, when a local restaurant owner was making a sandwich for a police officer and accidentally dropped a French roll into a pan containing beef drippings.