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• 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
• 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
• Electronics
  Technology
  Construction
  Sports Science
  Wind Energy
  Civil Engineering
   
  

  Circuit design

  The process of circuit design can cover systems ranging from national power grids all the way down to the individual transistors within an integrated circuit. For simple circuits the design process ... > more
• Chemistry
  Inorganic Chemistry
  Organic Chemistry
  Biochemistry
  Nature of Water
  Sports Science
   
  

  Peptide bond

  A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H2O). This is ... > more
• Thermodynamics
  Nature of Water
  Energy and the Environment
  Sports Science
  Chemistry
  Inorganic Chemistry
   
  

  Temperature

  Temperature is the physical property of a system which underlies the common notions of "hot" and "cold"; the material with the higher temperature is said to be hotter. Physically, temperature is a ... > more
• Solar Energy
  Energy Policy
  Energy Technology
  Wind Energy
  Petroleum
  Alternative Fuels
   
  

  Biomass

  Biomass is organic non-fossil material, collectively. In other words, 'biomass' describes the mass of all biological organisms, dead or alive, excluding biological mass that has been transformed by ... > more
• Energy and the Environment
  Solar Energy
  Renewable Energy
  Geomagnetic Storms
  Environmental Science
  Graphene
   
  

  Solar cell

  A solar cell (or a "photovoltaic" cell) is a device that converts photons from the sun (solar light) into electricity. In general, a solar cell that includes both solar and nonsolar sources of light ... > more
• Ice Ages
  Global Warming
  Climate
  Nature of Water
  Oceanography
  Snow and Avalanches
   
  

  Ice age

  An ice age is a period of long-term reduction in the temperature of Earth's climate, resulting in an expansion of the continental ice sheets, polar ice sheets and mountain glaciers. Glaciologically, ... > more
• Botany
  Sports Science
  Sea Life
  Ecology Research
  Invasive Species
  Marine Biology
   
  

  Algae

  Algae (singular alga) encompass several different groups of living organisms that capture light energy through photosynthesis, converting inorganic substances into simple sugars using the captured ... > more
• Organic Chemistry
  Sports Science
  Sports Medicine
  Nutrition
  Triglycerides
  Heartburn
   
  

  Alkaloid

  An alkaloid is a nitrogenous organic molecule that has a pharmacological effect on humans and animals. The name derives from the word alkaline; originally, the term was used to describe any ... > more

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