Kicking off our TNW Europe 2014_conference in Amsterdam this morning, Duolingo_co-founder Luis von Ahn announced the upcoming launch of its Duolingo Test Center, a new_standardized language test that you take on_a mobile app. In order to verify your test results, the app will monitor you by using your camera and microphone and ask you to stand in a corner to make sure no one is behind you feeding you answers. Duolingo will use human proctors to ensure that you’re playing by the rules. The test will cost $20, as compared to $300 for equivalent in-person certification tests. Duolingo plans to...

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