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Word Count: 413
In our modern world it seems that everything from business to transportation is progressing at an ever accelerating pace compared to how it was 100 or even 50 years ago For instance in the 18th century General George Washington was able to successfully lead his army to victory in the American Revolution after quitting the military for 15 years In todays fast paced world such a feat would be impossible to accomplish Imagine a soldier who fought in the Persian Gulf War leaving the military then rejoining and fighting in the Iraqi war An explanation for this acceleration lies in the study of anthropology Anthropologists divide the history of humanity into several ages such as the Stone Age Bronze Age Iron Age etc with each age being shorter than its predecessors Several major roadblocks in the transition of caveman to human explain why the Stone Age lasted for two million years One of the most prominent differences between a human and an ape is the size of their brains The brain of a modern human is 3 times the size of what it was 2 million years ago due to a humans long generation rate of about 13 years As a result it wasnt until 12000 years ago that man learned how to make a fire and it wasnt until 2000 years later that man began to change his hunter-gatherer lifestyle In addition during the Stone Age several ice ages occurred Man had to adapt to changing climates and conditions Furthermore man was constantly on the move chasing herds of mastodons and other sources of food As a result humans kept their hunter-gatherer lifestyle until after the last glacier retreated paving the way to the Agricultural Revolution which marked the end of the Stone Age Isolation was the most important reason why humans progressed so slowly during this period Throughout the Stone Age humans lived in groups of about 20 to 50 people seldom meeting
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