1840s: Samuel Morse, American portrait painter, invents Morse Code, a code of dots and spaces that the United States government uses to keep messages secret from its political enemies.
Today: The United States constructs increasingly more sophisticated methods of keeping messages secret, and employs mathematicians to try to break the codes of other countries.
Early 1840s: Frenchman Louis Daguerre, a scenepainter, invents the daguerreotype, a method that uses a lens and light, along with a chemical reaction, to capture exact images. The first daguerreotypes are used mainly for landscapes— including the first photograph of Paris—and portraits.
Today: Photography comes in many types, including.....
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