Sometimes my computer stops detecting wireless networks.

I know it's the computer because no networks are listed - not just mine. It's happened a couple of times now. Turning off and turning off airport doesn't work... restarting does though. What's the cause and how can I fix it?

Almost certainly none of the above!  Try each of the following in this order:
Select 'Reset Safari' from the Safari menu.
Close down Safari;  move <home>/Library/Caches/com.apple.Safari/Cache.db to the trash; restart Safari.
Change the DNS servers in your network settings to use the OpenDNS servers: 208.67.222.222 and 208.67.220.220
Turn off DNS pre-fetching by entering the following command in Terminal and restarting Safari:
          defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean false

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