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• Construction
  Sports Science
  Nature of Water
  Civil Engineering
  Materials Science
  Organic Chemistry
   
  

  Concrete

  In construction, concrete is a composite building material made from the combination of aggregate and cement ... > more
• Weapons Technology
  Renewable Energy
  Energy and the Environment
  Physics
  Nuclear Energy
  Geomagnetic Storms
   
  

  Radioactive decay

  Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles (radiation). Decay is said to occur in the parent nucleus and produces a daughter ... > more
• Nature of Water
  Thermodynamics
  Sports Science
  Water
  Physics
  Environmental Science
   
  

  Evaporation

  Evaporation is one of the two forms of vaporization. It is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the ... > more
• Healthy Aging
  Attention Deficit Disorder
  Hazardous Waste
  Sports Science
  Chemistry
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  Polychlorinated biphenyl

  Polychlorinated biphenyls (PCBs) are a class of organic compounds with 1 to 10 chlorine atoms attached to biphenyl. Although the physical and chemical properties vary widely across the class, PCBs ... > more
• Volcanoes
  Nature of Water
  Sports Science
  Natural Disasters
  Quantum Physics
  Tsunamis
   
  

  Pumice

  Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite. Pumice is usually light in colour ranging from white, yellowish, ... > more
• Healthy Aging
  Organic Chemistry
  Attention Deficit Disorder
  Sports Science
  Chemistry
  Inorganic Chemistry
   
  

  Formaldehyde

  The chemical compound formaldehyde (also known as methanal), is a gas with a strong pungent smell. Formaldehyde readily results from the incomplete combustion of carbon-containing materials. It may ... > more
• Sports Science
  Physics
  Quantum Physics
  Nature of Water
  Batteries
  Chemistry
   
  

  Nature

  Nature (also called the material world, the material universe, the natural world, and the natural universe) is all matter and energy, especially in its essential form. Nature may refer to the general ... > more
• Physics
  Quantum Physics
  Quantum Computers
  Quantum Computing
  Spintronics
  Spintronics Research
   
  

  Quantum dot

  A quantum dot is a semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes, or excitons (bound pairs of conduction band electrons and valence band holes) ... > more
• Mining
  Pollution
  Healthy Aging
  Attention Deficit Disorder
  Sports Science
  Sports Medicine
   
  

  Lead

  Lead is a chemical element in the periodic table that has the symbol Pb and atomic number 82. Lead has a dull luster and is a dense, ductile, very soft, highly malleable, bluish-white metal that has ... > more
• Acid Rain
  Pollution
  Air Pollution
  Organic Chemistry
  Biochemistry
  Environmental Issues
   
  

  Acid

  An acid (often represented by the generic formula HA) is traditionally considered any chemical compound that, when dissolved in water, gives a solution with a pH of less than 7.0. That approximates ... > more

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