(260424) -- VIENNA, April 24, 2026 (Xinhua) -- A visitor takes photos of exhibits at the Museum of Applied Arts during the Long Night of Research (LNF) in Vienna, Austria, April 24, 2026. The Long Night of Research (LNF) is Austria's largest event on science, research and innovation, and it takes place throughout the whole country every two years. (Xinhua/He Canling)