FACTOID # 95: You can be imprisoned for not voting in Fiji, Chile and Egypt - at least in theory.
 
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Encyclopedia > Aura (optics)

An aura is an optical effect wherein gas or dust surrounding an object luminesces or reflects light from the object. Optics (appearance or look in ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter. ... Luminescence is light not generated by high temperatures alone. ...



 

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