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121Omar Khayyám — Khayyam redirects here. For other uses, see Khayyam (disambiguation). Omar Khayyám عمر خیام A depiction of Omar Khayyám, in the works of Edward FitzGerald Full name Omar Khayyám عمر خیام …
122Asteroid deflection strategies — are methods by which near Earth objects could be diverted, preventing potentially catastrophic impact events. A sufficiently large impact would cause massive tsunamis and/or, by placing large quantities of dust into the stratosphere blocking… …
123Image scanner — Desktop scanner, with the lid raised. An object has been laid on the glass, ready for scanning …
124international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
125Diatomaceous earth — A sample of diatomaceous earth Diatomaceous earth (  / …
126mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… …
127Extinction event — …
128Tunguska event — The Tunguska Event, or Tunguska explosion, was a powerful explosion that occurred near the Podkamennaya (Lower Stony) Tunguska River in what is now Krasnoyarsk Krai of Russia, at around 7:14 a.m. [P. Farinella, L. Foschini, Ch. Froeschl eacute;,… …
