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speed of light |
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speed of lightSpeed at which light and other electromagnetic waves travel in a vacuum. Its value is 299,792,458 m per second/186,282 mi per second but for most calculations 3 × 108 m s−1 (300 million metres per second) suffices. In glass the speed of light is two-thirds of its speed in air, about 200 million metres per second. The speed of light is the highest speed possible, according to the theory of relativity, and its value is independent of the motion of its source and of the observer. It is impossible to accelerate any material body to this speed because it would require an infinite amount of energy. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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NEW YORK -- Leading trading and technology firms, Schonfeld Group Holdings, LLC and Lightspeed Holdings, LLC, today announced the two companies have signed a definitive agreement to merge their respective retail trading operations. Lightspeed Research, a global online interactive marketing research solutions provider, announced the appointment of Antonio Yenidjeian as its Chief Information Officer (CIO). Last November, Mark McMurray, Frenchtown School District's technology coordinator, thought it prudent to implement Message Journaling from Lightspeed Systems after nearby school districts had all their email records subpoenaed by a politician suspecting school email accounts were used to defeat his initiative. |
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