From lakes and grasslands with hippos and giraffes to a vast desert, North Africa's sudden geographical transformation 5,000 years ago was one of the planet's most dramatic climate shifts.
The transformation took place nearly simultaneously across the continent's northern half, a new study finds. The results will appear in an upcoming issue of the journal Earth and Planetary Science Letters.
http://www.livescience.com/28493-when-sahara-desert-formed.html
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Estos avances tecnológicos hicieron que el aprendizaje fuera más divertido y conveniente. Otra forma en que la tecnología ha impactado a la sociedad es a través de la comunicación, cómo hablamos y nos comunicamos entre nosotros en todo el mundo. ... Por último, los avances tecnológicos que se realizaron dentro de la industria de la salud han ayudado a mantener a las personas seguras y saludables.
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Black codes were laws denying most legal rights to newly freed slaves, passed by southern states following the civil war. Example, by making murder or life threatening injury of slaves a crime, and a few states allowed slaves a limited amount of self defense.
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