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Wolfram Alpha for iPhone packs big features and a big $50 pricetag

When Wolfram Alpha, the (don't call it a search engine!) computation knowledge engine, announced an iPhone app, I assumed it would just be a nice front end for the website. I also figured it would be free. Surprise! The Wolfram Alpha app does a lot more than expected, and it also carries a hefty $50 price tag. This might not be the smartest business decision for Wolfram, considering that App Store...