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The footage of Crowther's multilingual feat attracted over 18 million views on social media.
Crowther has stunned people before with his interviewing from around the world. RTL Today interviewed him back in 2018 and, since then, he's become one of the best-known Luxembourgers around the world.
His latest report from the Ukrainian capital Kyiv has, at the time of writing, attracted over 150,000 likes on Twitter, as well as a flood of comments.
The languages spoken are, in order: English, Luxembourgish, Spanish, Portuguese, French, and German.
Popular language learning app Duolingo posted that it was 'too stunned to speak' in response to the feat.
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A host of prominent journalists also chimed in, with the UK's Channel 4 International News Editor, Lindsey Hilsum, tweeting 'Well - we're impressed! And envious!'.
If nothing else, the video helped to raise the profile of the Luxembourgish language. One social media user posted 'And I knew Luxembourgish existed, but never really thought about it, even while spending a holiday there... I guess I just thought of it as sort of German?'.
