Icicles form when water falling from objects freezes. Can occur during subfreezing weather when melted ice refreezes. Form on vertical surfaces like road cuts and cliffs. Can grow as tubes with walls 0.1mm thick and 5mm wide. Growth rate can exceed 1cm per minute under ideal conditions
Aircraft noise originates from engine rotation, aerodynamics, and aircraft systems. Engines can exceed 140 dB during takeoff, creating buzzsaw noise. Aerodynamic noise increases with speed and altitude. Cockpit and cabin systems contribute significantly to cabin noise
Last mile refers to the final leg of transportation journey from hub to destination. Concept originated from telecommunications industry's home-to-network connection challenges. In supply chain, describes logistics challenges from hubs to final destinations
CO is an odorless, colorless gas that can cause sudden illness and death. More than 400 Americans die yearly from unintentional CO poisoning. Common symptoms include headache, dizziness, and confusion
Over half of world's population lives in urban areas. Concrete flood-relief channels can cause flooding elsewhere. Levees built along rivers spread floodwaters farther downstream
Health is absence of disease and complete physical, mental and social well-being. Occupational health aims to protect workers from work-related illnesses. Main objective is continuous hazard identification and control at source