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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.

fxSolver is a math solver for engineering and scientific equations. To get started, add some formulas, fill in any input variables and press "Solve."

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.

Drag and drop countries around the map to compare their relative size. Is Greenland really as big as all of Africa? You may be surprised at what you find! A great tool for educators.

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.

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

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

Integrales Irracionales. Función Beta. Función Chi-cuadrado. Función Gamma. Portal Estadística Aplicada. Consultoría Estadística-Econometría. Máster Econometria. Nobel Economía

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

AulaFacil.com: Los mejores cursos gratis online

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

Acceso al área personal de Tusclasesparticulares. Gestiona tus anuncios, modifícalos, consulta y responde los e-mails interesados, consulta tus estadísticas, publica nuevos anuncios... Disponible para profesores particulares, alumnos y centros.

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

Física y matemáticas para estudiantes, profesores y curiosos. Con contenidos teóricos, ejercicios interactivos, problemas resueltos, animaciones y mucho más. Aprende la ciencia a tu ritmo.