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Washington DC.,USA, April 26, 1989. Supporters for and against legal abortion face off during a protest outside the United States Supreme Court Building during Webster V Health Services
Pro and Con: Abortion
United States elections portal page linking to each election interactive
A History of U.S. Presidential Elections in Maps
Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd
Causes of the Great Depression
United States electoral college map showing number of electoral votes by state.
How Does the Electoral College Work?
David Cameron. President Barack Obama and Prime Minister David Cameron of the United Kingdom talk during the G8 Summit at the Lough Erne Resort in Enniskillen, Northern Ireland, June 17, 2013
What’s the Difference Between a President and a Prime Minister?
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
Jackson (Wyoming, United States). Jackson Lake (also called Jackson Hole), southern end of the Teton Range (the Grand Tetons), Grand Teton National Park, Wyoming, USA
7 Wonders of America

trackball

input device

Learn about this topic in these articles:

computer peripherals

  • computer
    In computer: Input devices

    Mechanical mice and trackballs operate alike, using a rubber or rubber-coated ball that turns two shafts connected to a pair of encoders that measure the horizontal and vertical components of a user’s movement, which are then translated into cursor movement on a computer monitor. Optical mice employ a…

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