Cities, floating on the ocean. It sounds like science fiction, but could soon become reality. Researchers are developing concepts for life on water - on a grand scale. Initial tests are promising. Is success a genuine possibility? Over half of humanity lives near the coast. But in many places, flooding is a constant threat, forcing entire populations to search for new habitats. Paradoxically, these could be located directly on the water. Cities, floating on the ocean. It sounds like science fiction, but could soon become reality. International research has long been developing concepts for life on water. Now, new designs — from temporary huts to affordable student dormitories to smart high-tech villas — seem to hold promise. Could huge numbers of people soon be living in "floating cities”?