Herbert Hoover and Franklin D. Roosevelt were the presidents during the Great Depression.
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During WWII women worked in factories producing munitions, building ships, aeroplanes, in the auxiliary services as air-raid wardens, fire officers and evacuation officers, as drivers of fire engines, trains and trams, as conductors and as nurses.
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The discoveries in the Olduvai Gorge in East Africa have suggested that the early humans were using primitive types of tools. This tools were made mainly from stone and bones, and they had multiple uses in their daily lives. Most of the tools found are sharpened stones and pointy parts of bones, mostly used for cutting flesh and piercing.