Dear Amy: How are CD-ROMs made? — Daniel, Hazelhurst, Miss.
Dear Daniel: CD-ROMs, a type of data CD that holds software, provide a great way for a company to sell its software because CD-ROMs are durable and cheap to produce. CDs are made from layers of different materials. The base layer of the CD is made of plastic with little microscopic bumps impressed into the plastic. These bumps spiral around the CD and store the data on the disk. The plastic layer is then covered with a reflective layer of aluminum and is then coated with a protective acrylic layer. To learn more about how CDs are made, visit www.worldwise.com/reccdsanddv.
html. (This site is no longer available.)
Dear Amy: How many people use the internet? — Bethany, Chapel Hill, N.C.
Dear Bethany: There is no way to tell exactly how many people use the Internet, although estimates have been made. Not all people with the ability to access the Internet actually use it. In September 2002, the total number of Internet users was estimated at over 600 million! You can find more Internet user statistics at www.sociosite.org/demography.php.
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