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  Radio

  Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) ... > more
• Physics
  Quantum Physics
  Albert Einstein
  Sports Science
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  Thermodynamics
   
  

  Time in physics

  In physics, the treatment of time is a central issue. In physics, the treatment of time is a central issue. It has been treated as a question of geometry. One can measure time and treat it as a ... > more
• Robotics
  Artificial Intelligence
  Robotics Research
  Engineering
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  Detectors
   
  

  Humanoid robot

  A humanoid robot is a robot with its overall appearance based on that of the human body. In general humanoid robots have a torso with a head, two arms and two legs, although some forms of humanoid ... > more
• Petroleum
  Fossil Fuels
  Organic Chemistry
  Alternative Fuels
  Fuel Cells
  Aviation
   

  Catalytic converter

  A catalytic converter is a device used to reduce the emissions from an internal combustion engine. Most commonly used in an automobile's exhaust system, catalytic converters are now commonly used on ... > more
• Fossil Fuels
  Petroleum
  Graphene
  Alternative Fuels
  Sports Science
  Chemistry
   
  

  Hydrocarbon

  In chemistry, a hydrocarbon is any chemical compound that consists only of the elements carbon (C) and hydrogen (H). They all contain a carbon backbone, called a carbon skeleton, and have hydrogen ... > more
• Energy and the Environment
  Petroleum
  Renewable Energy
  Environmental Science
  Oil Spills
  Fossil Fuels
   
  

  Biodiesel

  Biodiesel refers to a diesel-equivalent, processed fuel derived from biological sources. Though derived from biological sources, it is a processed fuel that can be readily used in diesel-engined ... > more
• Renewable Energy
  Energy and the Environment
  Sports Science
  Nuclear Energy
  Healthy Aging
  Sports Medicine
   
  

  Chernobyl disaster

  The Chernobyl disaster was an accident at the Chernobyl Nuclear Power Plant on April 26, 1986 at 01:23 a.m., consisting of an explosion at the plant and subsequent radioactive contamination of the ... > more
• Cosmic Rays
  Black Holes
  Detectors
  Space Telescopes
  Medical Technology
  Medical Imaging
   
  

  X-ray

  X-rays are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.1 nanometers, corresponding to frequencies in the range 30 to 3000 PHz. X-rays are primarily used for ... > more
• Nature of Water
  Wind Energy
  Aviation
  Sports Science
  Vehicles
  Optics
   
  

  Aerodynamics

  Aerodynamics (shaping of objects that affect the flow of air, liquid or gas) is a branch of fluid dynamics concerned with the study of forces and gas flows. The solution of an aerodynamic problem ... > more
• Quantum Physics
  Physics
  Optics
  Albert Einstein
  Sports Science
  Graphene
   
  

  Wave-particle duality

  In physics and chemistry, wave-particle duality holds that light and matter exhibit properties of both waves and of particles. A central concept of quantum mechanics, duality addresses the inadequacy ... > more

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