Resena: Just a few hundred years ago, life was far different than it is today. When people wanted to travel or communicate, they had to go on foot or horseback. A journey of just a few miles by this method could be a long, arduous process.
Whatever people owned—from clothing to tools—had to be made by hand. Work was manual, laborious, and often tedious. Illness was a constant threat; diseases rapidly spread through unsanitary conditions and were difficult to treat with the rudimentary medicines available. Today, life in the United States and other developed countries is about ease and convenience. Communication is global and instantaneous. Transportation can carry people across states, countries, and even entire continents in a matter of hours. Industry has been automated, providing people with plenty of time outside of work to enjoy leisure pursuits. Modern medical treatments have enabled people to stay healthy well into their eighth, ninth, or even tenth decade.

Idioma: INGLES
Categoría: Ciencia, Divulgación

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