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What greek scientist created a screw to move water for irrigation?

During the period from 1865 to 1898 how did the political/economic elite contain the demands of farmers and laborers for economic justice

Why does c. wright mills identify critical thinking as one of the most important criteria for the development of intellectual craftsmanship? why is constantly being aware of the biased nature of your reactions and interactions (what c. wright mills calls self-reflexive) key to the development of that critical thinking? finally, why is keeping a file important, how can it lean to intellectual curiosity which can foster critical thinking and to develop a keen analytical mind?