in reply to Bad math
This question comes up frequently, and not just on Perl websites. The last time I saw the question I spent some time working on a response with the goal of it being more approachable than the standard "What every computer scientist..." article is. I'm so glad I don't have to type it all over again.
Here's a link to my previous post on the topic: Re: shocking imprecision.
Dave
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Seekers of Perl Wisdom