Science / Geology / Index Of Refraction: The ratio of the speed of light in a vacuum to the speed in a material: this ratio determines the amount that light is refracted as it passes into a crystal.
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Index Noun Synonyms: guide, directory, list, listing, table of contents, catalogue, key, thesaurus
Index Adjective Synonyms: mark, sign, clue, token, hint, pointer, indicator, indication, guide
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Science / Geology / Refraction (Wave): The departure of a wave from its original direction of travel at the interface with a material of different index of refraction (light) or seismic wave velocity (see also Seismic refraction). MORE
Entertainment / Ice Hockey / Playoff Beard: A playoff beard is the superstitious practice of a national hockey league (nhl) player not shaving his beard during the stanley cup playoffs. MORE
Lifestyle / Painting / Plaster Of Paris: A quick setting, pure white powder, used to set bathroom wall fixtures such as towel racks or used by craft groups for pouring molds and making plaster objects. MORE
Business / Agriculture / Plant Variety Protection Act Of 1970: P.L. 91-577 (December 24, 1970) was enacted to provide patent-like protection for new non-hybrid seed varieties. The ultimate goal was to create an incentive for public and private research on new com MORE
Health / Disease / Plague Of Justinian: (541-542) The Plague of Justinian was a pandemic that afflicted the Byzantine Empire, including its capital Constantinople, in the years 541?€“542 AD. It has been speculated that this pandemic was MORE