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  2. Computer network - Wikipedia

    en.wikipedia.org/wiki/Computer_network

    A computer network extends interpersonal communications by electronic means with various technologies, such as email, instant messaging, online chat, voice and video telephone calls, and video conferencing. A network allows sharing of network and computing resources.

  3. Wikipedia:Reference desk/Archives/Science/May 2006

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    Things are particuarly nice for the US, because NASA World Wind will retrieve free USGS topographic maps, landsat photos, and (for major US cities) detailed aerial photography. All of that stuff is public domain, and can be used in Wikipedia directly or as the basis for composites, diagrams, maps, etc.

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