JDS Uniphase was one of the high fliers back in the boom days of the tech industry. It soared to more than $150 a share at the start of 2000, and then began a precipitous decline to its current price of under $3 a share.

This was a classic example of people buying into companies they knew nothing about. If I told you that it "provides communications test and measurement solutions, and optical products for telecommunications service providers, cable operators and network equipment manufacturers," would you really understand its business?

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