The "magic water stream" from the mountains: Frozen or liquid?

The mobile video of an Italian spread rapidly: The jet of water is frozen! So it seems - until a hand comes into the picture. Here we ask a fluid mechanic what lies behind the startling phenomenon.


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REF: http://www.spiegel.de/video/laminare-stroemung-wasserstrahl-sieht-wie-gefroren-aus-video-99024137.html