Los primeros homínidos abandonaron los árboles y comenzaron a caminar erguidos y sobre sus dos pies hace al menos 3,6 millones de años, tal y como confirmó un estudio difundido el viernes por la revista PLoS ONE. Según científicos de tres universidades estadounidenses, se creía que hasta entonces esos homínidos no eran bípedos y que pasaban la mayor parte de su vida en los árboles. A finales de la década de 1960 un grupo de científicos descubrió en Laetoli, Tanzania, marcas de pisadas de homínidos preservadas en cenizas volcánicas desde hacía unos 3,6 millones de años. Las marcas de esas pisadas habrían sido dejadas por miembros del grupo homínido Australopithecus afarensis. Esa especie incluye a 'Lucy', cuyo esqueleto fosilizado es el más completo de un Australopithecus encontrado hasta ahora.
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The 1920s and 1950s are similar in the sense that a new culture emerged. One similarity between these time periods is that they represent the United States emerging from a World War. World War I (1914-1919) and World War II (1939-1945) were two enormous global events that affected American society and alter what culture develops afterwards.
One common culture that developed during the 20's and 50's was consumerism. Consumerism is an social and economic idea that focuses on developing products that will interest the consumer (aka buyer). During both eras, companies began to advertise items in a manner that convinced American citizens to buy them. This rise of consumerism resulted in the increased purchase of items that people wanted, but didn't necessarily need.
Even though most Americans would fall into this category, there were some critics to this consumer culture. During the 1950's the Beatnik generation developed as an anti-conformist culture. Some of them saw capitalism and the increased consumerism in American society as negative.
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