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In the late 19th century, luminiferous aether, æther or ether, meaning light-bearing aether, was the postulated medium for the propagation of light.

STL (file format)

STL (STereoLithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL is also known as Standard Tessellation Language[1] This file format is supported by many other software packages; it is widely used for rapid prototyping and computer-aided manufacturing. STL files describe only the surface geometry of a three dimensional object without any representation of color, texture or other common CAD model attributes. The STL format specifies both ASCII and binary representations. Binary files are more common, since they are more compact

List of countries by GDP

2013 1,426 $5.4 trillion 2012 1,226 $4.6 trillion 2011 1,210 $4.5 trillion 2010 1,011 $3.6 trillion 2009 793 $2.4 trillion 2008 1,125 $4.4 trillion 2007 946 $3.5 trillion 2006 793 $2.6 trillion 2005 691 $2.2 trillion 2004 587 $1.9 trillion 2003 476 $1.4 trillion 2002 497 $1.5 trillion 2001 538 $1.8 trillion 2000 470 $0.9 trillion$898 billion

Magnetic pressure

Magnetic pressure is an energy density associated with the magnetic field.

Interplay between magnetic pressure and ordinary gas pressure is important to both the fields of magnetohydrodynamics and plasma physics. Any magnetic field has an associated pressure that is contained by the boundary conditions on the field, and a gradient in field strength causes a force due to the magnetic pressure gradient; this force is called the magnetic pressure force.