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Race against live opponents typing quotes from books, movies, and songs.

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Cambios de moneda mundiales e historia de las tasas de cambio de moneda

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The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands). Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.” There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

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English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese

Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.

Estupendo graficador 3D online con el cual podrás generar increibles gráficas 3D de funciones de dos variables, superficies parametricas, vectores, etc.

Online Graph draw: plot function, plot parametric curves,plot polar curves.

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Online graph sketching app that can graph functions and numerically solve differential equations. Requires Javascript HTML 5.

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Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.

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An interactive 3D visualization of the stellar neighborhood, including over 100,000 nearby stars. Created for the Google Chrome web browser.

Symbolab: búsqueda de ecuaciones y solucionador matemático - resuelve problemas de álgebra, trigonometría y cálculo paso a paso