Mount Etna, Europe's tallest active volcano, has been erupting for days, spewing ash and lava. This spectacle has attracted a surge of tourists, with local guides reporting a threefold increase in requests for nighttime hikes. The eruption has caused disruptions, including the closure of Catania airport, a major hub for visitors to Sicily. AI
RANK_REASON The cluster describes a natural event (volcanic eruption) and its impact on tourism, not a scientific or AI-related development. [lever_c_demoted from research: ic=1 ai=0.0]
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