Stock Photo - 20 May 2020, Baden-Wuerttemberg, Konstanz am Bodensee: Aquatic ecologist Hannes Imhof (r) explains to Anne Hartig on camera how a plankton net works and is used on board the research vessel ""Aldebaran"". In Corona times, they show how they can virtually involve schoolchildren from Baden-Württemberg in expeditions and investigations. The research and media ship ""Aldebaran"" is already on its fifth trip on Lake Constance. Photo: Felix Kästle/dpa. - Konstanz am Bodensee/Baden-Wuerttemberg/Germany

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