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" "El mundo es totalmente diferente si la máxima velocidad de un mensaje es la que pueden alcanzar un caballo o una carabea, o bien la de la luz. La velocidad de la luz significa que podemos hablar - prácticamente a tiempo real- con cualquier persona de la Tierra o incluso de la Luna. Pensemos en la medicina. Hace unos siglos, la mayoría de los niños nacidos en las grandes familias de Europa morían en la infancia, a pesar de contar con la mejor asistencia médica de su época. Hoy en día, incluso los pobres de algunas naciones tienen una mortalidad infantil asombrosamente inferior a la de las cabezas coronadas del siglo XVII. O pensemos en la disponibilidad de medios seguros y baratos de control de la natalidad, que implica una revolución en las relaciones humanas y, sobre todo, en la condición de las mujeres.
Carl Edward Sagan (9 November 1934 – 20 December 1996) was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. His best known scientific contribution is research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Sagan assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, universal messages that could potentially be understood by any extraterrestrial intelligence that might find them. Sagan argued the hypothesis, accepted since, that the high surface temperatures of Venus can be attributed to, and calculated using, the greenhouse effect. He testified to the US Congress in 1985 that the greenhouse effect will change the earth's climate system.
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Or consider the mainstream religions. We are enjoined in Micah to do justly and love mercy; in Exodus we are forbidden to commit murder; in Leviticus we are commanded to love our neighbor as ourselves; and in the Gospels we are urged to love our enemies. Yet think of the rivers of blood spilled by fervent followers of the books in which these well-meaning exhortations are embedded.