People should know their heroes: a simple, yet essential tool was invented by resident of New York Michael Birn. Corkscrew made life easier for both adults and school children, as the latter now memorize the magnetic field vector direction using the rule of corkscrew euphemistically described as screwdriver one in our textbooks.
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What saints did the conquistadors pray to and why did they decide to conquer Mexico? What was the ethnic, regional, and age composition of the Conquista?