Finders keepers, and anyone who finds your email address on the Web can use it to send you mail you don't want or to find out where you live. If you get a message from someone you don't know, tell your parents right away.

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RealPlayer streams sound and video files. The files start playing before they finish downloading, so you don't have to wait for the whole file to start listening or watching.

Ask a grownup for help finding the free RealPlayer plug-in at http://www.real.com/freeplayer/?rppr=pbskids.org