Hoy usted puede ver por televisi n un partido que se juega en este mismo instante en Alemania; puede hablar por tel fono celular con su hermano que est escalando el cerro Manquehue; puede escuchar y ver una sinfon a que dura m s de una hora mediante un reproductor de DVD; puede comunicarse a trav s del e-mail en forma inmediata con un familiar que se encuentra en Jap n; puede operarse los ojos con rayos l ser en la ma ana y en la tarde ya estar en su casa. En fin Puede hacer much simas cosas que hace cien a os, cuando Albert Einstein public sus geniales trabajos en la revista Annalen der Physik, eran impensadas. Gracias a sus investigaciones, se cambiaron los conceptos b sicos de la ciencia moderna, trayendo el vertiginoso desarrollo tecnol gico del siglo XX. En estas p ginas, todo lector atento, sin tener ning n conocimiento mayor sobre estos temas, comprender en forma sencilla y amena las repercusiones que la teor a de la relatividad ha tenido en la ciencia y t cnica contempor nea.

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