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  1. Site news – Sources of news about Wikipedia and the broader Wikimedia movement. Teahouse – Ask basic questions about using or editing Wikipedia. Help desk – Ask questions about using or editing Wikipedia. Reference desk – Ask research questions about encyclopedic topics. Content portals – A unique way to navigate the encyclopedia.

  2. The Deutsch–Jozsa problem is specifically designed to be easy for a quantum algorithm and hard for any deterministic classical algorithm. The motivation is to show a black box problem that can be solved efficiently by a quantum computer with no error, whereas a deterministic classical computer would need a large number of queries to the black ...

  3. When the Simple English Wikipedia began, the ordinary English Wikipedia already had 150,000 articles, and seven other Wikipedias in other languages had over 15,000 articles. Since the other Wikipedias already have so many articles, most Simple English articles take articles from other Wikipedias and make them simple; they are usually not new ...

  4. In botany, a stoma (plural = stomata) is a tiny opening or pore. It is found on plant leaves and stems, and any other green parts of the plant. It is used for gas exchange. Stomata are mostly found on the under-surface of plant leaves. Almost all land plants have stomata. Stomata have two main functions.

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