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In the early days, Walter Isaacson says, computers were "big ol' things with vacuum tubes" that took up entire rooms. For example, the electric analog computer named ANACOM (shown here in 1950 at Caltech) weighed 6,000 pounds and filled 13 cabinets. AP hide caption

itoggle caption AP

Meg Whitman, the current president and CEO of Hewlett-Packard, will lead one of the two companies the tech giant is creating by dividing its corporate services and printing/PC units. Richard Drew/AP hide caption

itoggle caption Richard Drew/AP

Jean Jennings (left) and Frances Bilas set up the ENIAC in 1946. Bilas is arranging the program settings on the Master Programmer. Courtesy of University of Pennsylvania hide caption

itoggle caption Courtesy of University of Pennsylvania

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Yahoo co-founder Jerry Yang at the 2008 Consumer Electronics Show in Las Vegas. Yahoo will gain nearly $8 billion from the Alibaba IPO because of its $1 billion investment in Alibaba 2005. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP

Apple CEO Tim Cook speaks in Cupertino, Calif., on Tuesday. The company unveiled a new mobile payment system called Apple Pay, which uses security built into the latest iPhones. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

The Samsung Galaxy Mega (from left), Samsung Galaxy S4 and Apple iPhone 5 are shown. Apple is expected to announce larger models of its smartphone on Tuesday. Richard Drew/AP hide caption

itoggle caption Richard Drew/AP

Uber is hiring David Plouffe, the mastermind of Obama's 2008 campaign, to power its own political strategy. What can a tech-savvy political animal offer a ride-sharing service? Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Brooke Hammerling, the founder of Brew Media Relations, says she created her own firm because she got sick of a mix of dismissive tech guys and sexism inside some companies. Christof Stache/dpa/Landov hide caption

itoggle caption Christof Stache/dpa/Landov