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Question: What makes the "busy signal" on the phone? Answer: A busy signal is an audio tone that is actually a combination of a 480-hertz and a 620-hertz tone, with a cycle of one-half second on and one-half second off.

Check out http://electronics.howstuffworks.com/telephone4.htm to hear the busy tone that is described above and to find out more about how sounds help us to communicate.

Word Search Puzzle

Solve this word search puzzle by finding fundamental physics features:
http://funphysics.jpl.nasa.gov/adventures/word-find.html

Fun in the Dark

Move your cursor around to hunt for warm and cold-blooded animals and learn how infrared technology works:
http://coolcosmos.ipac.caltech.edu/cosmic_games/hide_seek/index.html

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