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History of PDF. The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008. Since then, it has been under the control of an International Organization for Standardization (ISO) committee of ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 October 2024. Portable Document Format, a digital file format For other uses, see PDF (disambiguation). Portable Document Format Adobe PDF icon Filename extension.pdf Internet media type application/pdf, application/x-pdf application/x-bzpdf application/x-gzpdf Type code PDF (including a single ...
Swim fins are typically made of rubber or plastic. Benjamin Franklin invented wooden swim fins in 1717. [10] His original design consisted of 10-inch-long (250 mm) and 6-inch-wide (150 mm) palettes. Contrary to today's version of rubberized swim fins worn on the feet, Franklin's swim fins were originally intended for use on a person's hands.
America Today. America Today is a mural comprising ten canvas panels, painted with egg tempera in 1930–1931 by the American painter Thomas Hart Benton. It provides a panorama of American life throughout the 1920s, based on Benton's extensive travels in the country. Originally commissioned for The New School for Social Research, it has ...
t. e. The Declaration of Independence, formally titled The unanimous Declaration of the thirteen united States of America in both the engrossed version and the original printing, is the founding document of the United States. On July 4, 1776, it was adopted unanimously by the 56 delegates to the Second Continental Congress, who convened at ...
The Constitution of the United States is the supreme law of the United States. [ 3 ] It superseded the Articles of Confederation, the nation's first constitution, on March 4, 1789. Originally including seven articles, the Constitution delineates the frame of the federal government.
The Erie Canal opened Oct. 26, 1825 and proved one of the most successful public works projects in American history, reshaping large swaths of the national economy.
The rapid expansion of education past age 14 set the U.S. apart from Europe for much of the 20th century. [82] From 1910 to 1940, high schools grew in number and size, reaching out to a broader clientele. In 1910, for example, 9% of Americans had a high school diploma; in 1935, the rate was 40%. [190]