Locks are used as a technique to connect large bodies of water with one another or to connect ports with other ports or cities with other cities. Therefore, the locks were created to connect the Great Lakes with the St. Lawrence River to allow ships to travel from the Atlantic Ocean to the Great Lakes as far as Lake Superior.
On January 7, 1839, members of the French Académie des Sciences were shown products of an invention that would forever change the nature of visual representation: photography. The astonishingly precise pictures they saw were the work of Louis-Jacques-Mandé Daguerre (1787–1851), a Romantic painter<span> and printmaker most famous until then as the proprietor of the Diorama, a popular Parisian spectacle featuring theatrical painting and lighting effects. Each daguerreotype (as Daguerre dubbed his invention) was a one-of-a-kind image on a highly polished, silver-plated sheet of copper.</span>
On August 6, 1945, the United States detonated<span> an </span>atomic bomb<span> over the Japanese city of </span>Hiroshima<span>. Sixteen hours later, American President </span>Harry S. Truman<span> called again for Japan's surrender, warning them to "expect a rain of ruin from the air, the like of which has never been seen on this earth."</span>
