The evolution of technology has fundamentally changed people's lives. Throughout human history, machines have replaced humans for performing various tasks. For example, in agriculture, farming vehicles made farming work less labor-intensive and greatly increased productivity. In the US, as of 2008, less than 2 % of the population directly work in agriculture. They not only supply the food needed for the other 98% of the population, but also make the US the biggest agricultural products exporter. Examples in other areas include programmable telephone switchboards replacing telephone operators, and automatic elevators replacing elevator operators.
This trend of machines replacing humans sped up in the last several decades, largely due to the invention of computers. So far, there have been three computer-led revolutions in technology. Each of these...
