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I don't get it either. The only one that got me was that you have to scale some decimal numbers to whole numbers to multiply them.

    0.1 * 0.2 //0.020000000000000004
But this has never caused issue for me except when tried to make a "prime number finder" when I first started using it.

If I was going to build some stat site with a whole bunch of scientific data, I'd probably break out the python. IMO JavaScript is just the best language to work with if you're coding web sites or web applications (and probably prototyping custom UIs for anything). Plus you can use multiple languages server side easily, so use the right tool for the right job.

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