Credit Card-swipe Device To Test For Hundreds Of Diseases

Scientists successfully created a sensitive prototype device that could test for dozens or even hundreds of diseases simultaneously by acting like a credit card-swipe machine to scan a card loaded with microscopic blood, saliva or urine samples. The prototype works on the same principle -- giant magnetoresistance or GMR -- that is used to read data on computer hard drives or listen to tunes on portable digital music players.

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