Mastering a foreign language can change your life. It can open the door for a new career, or even a new country, not to mention an entire culture you would now be able to enjoy in its native tongue. But it's not easy, either, and takes time, persistence, and constant practice. Today, I'd like to show you language-learning service Duolingo's Android app, which is completely free, just like the rest of the service, and is definitely worth a look.
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