Not all businesses are original. Many are take-offs of an idea that just didn't work out for someone else.
That's the case with the guys behind Mango Languages, who turned an old idea into a fast-growing start-up. And creating jobs left and right in the process.
The four friends behind the Farmington Hills-based firm had been building a web-development firm earlier this decade.
Part of their jobs included working on a foreign language learning program. The creator was having difficulty,...
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