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• Tsunamis
  Natural Disasters
  Albert Einstein
  Quantum Physics
  Earthquakes
  Optics
   
  

  Seismic wave

  A seismic wave is a wave that travels through the Earth, most often as the result of a tectonic earthquake, sometimes from an explosion. There are two types of seismic wave, namely, 'body wave' and ... > more
• Organic Chemistry
  Chemistry
  Inorganic Chemistry
  Weapons Technology
  Spintronics
  Alternative Fuels
   
  

  Oxidizing agent

  An oxidizing agent (also called an oxidizer or oxidant) is referred to as a chemical compound that readily transfers oxygen atoms or a substance that gains electrons in a redox chemical reaction. ... > more
• Energy and the Environment
  Electricity
  Renewable Energy
  Energy Technology
  Sustainability
  Solar Energy
   
  

  Hydroelectricity

  Hydroelectricity is electricity obtained from hydropower. Most hydroelectric power comes from the potential energy of dammed water driving a water turbine and generator. Less common variations make ... > more
• Medical Technology
  Medical Imaging
  Physics
  Optics
  Today's Healthcare
  Healthy Aging
   

  Radiography

  Radiography is the creation of images by exposing a photographic film or other image receptor to X-rays. Since X-rays penetrate solid objects, but are weakened by them depending on the object's ... > more
• Graphene
  Nanotechnology
  Sports Science
  Organic Chemistry
  Electronics
  Materials Science
   
  

  Carbon nanotube

  Carbon nanotubes (CNTs) are an allotrope of carbon. They take the form of cylindrical carbon molecules and have novel properties that make them potentially useful in a wide variety of applications in ... > more
• Optics
  Energy Technology
  Sports Science
  Construction
  Petroleum
  Physics
   
  

  Lighting

  Lighting refers to either artificial light sources such as lamps or to natural illumination of interiors from sunlight. Lighting represents a major component of energy consumption, accounting for ... > more
• Batteries
  Energy Technology
  Electricity
  Fuel Cells
  Sports Science
  Biochemistry
   
  

  Battery (electricity)

  In science and technology, a battery is a device that stores chemical energy and makes it available in an electrical form. It consists of one or more voltaic cells, each of which is composed of two ... > 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
• Sports Science
  Nature of Water
  Materials Science
  Construction
  Graphene
  Civil Engineering
   
  

  Wood

  Wood has been an important construction material since humans began building shelters, and remains in plentiful use today. A tree increases in diameter by the formation, between the old wood and the ... > more
• Sports Science
  Physics
  Chemistry
  Inorganic Chemistry
  Nuclear Energy
  Weapons Technology
   
  

  Hafnium

  Hafnium is a chemical element in the periodic table that has the symbol Hf and atomic number 72. A lustrous, silvery gray tetravalent transition metal, hafnium resembles zirconium chemically and is ... > more

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