Engineering is the practical application of scientific knowledge in the design, building, and control of machines, roads, bridges, electrical apparatus, chemicals, etc. Engineering is classified into many branches. Some of them include military engineering, civil engineering, aeronautical engineering, electrical engineering, mechanical engineering, computer engineering, chemical engineering, engineering science, fire protection engineering, industrial engineering, nuclear engineering, ocean engineering, optical engineering, petroleum engineering, building engineering, planetary engineering, reverse engineering, software engineering, stellar engineering, textile engineering, micro process engineering, paper engineering, plastics engineering, process engineering, aquatic and environmental engineering, architectural engineering, climate engineering, earth systems engineering and management, ecological engineering, metallurgy and materials engineering, environmental engineering, geotechnical engineering, railway systems engineering, manufacturing engineering, hydraulic engineering, traffic engineering, broadcast engineering, communication systems engineering, control engineering, electronic engineering, electronics and communication engineering, instrumentation engineering, network engineering, biomedical engineering, engineering physics, engineering technology, acoustical engineering, aerospace engineering, ceramic engineering, crystal engineering, nanoengineering, transportation engineering, structural engineering, surface engineering, marine engineering, mining engineering, power engineering, powder engineering, sanitary engineering, sewage engineering, and river engineering. Engineering papers are published in journals such as the Aeronautical Journal, IEEE journals and letters, IEE journals, Nature journals and letters, Science, AIP journals and letters, ACS journals, AGU journals, Physical Review journals, and Elsevier journals. Such papers report cutting-edge research in various branches of engineering.