interesting 'different' use of CDs & CdRoms :
cut & pasted :
According to an article in Tape-Disk Business
    (http://www.tapediscbusiness.com/0601/0601tdb5.htm), Burstein
    Technologies Inc. (BTI) has demonstrated that by etching and boring
    tiny microfluidic channels in the disk and embedding various
    chemicals along some of those paths, a disk and a modified disk
    player can perform instant diagnostic blood tests!

    A drop of blood is placed near the center of the disk  When the
    "player" spins the disk, centrifugal force first separates the whole
    blood from the plasma, and then forces the blood and plasma through
    various on-disk chemical reactions and tests.  The (specialized)
    CD-player's laser then reads the results of the various tests.

    BTI figures that they can incorporate 80% of existing clinical blood
    tests into their CD laboratories, replacing $150,000+ laboratory
    analysis systems with a $1,000 "Labtop" machines that could easily
    be used in doctors' offices, or in tents, to provide inexpensive and
    immediate test results.

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