Silicon Valley is geographically based too, and its center of gravity has shifted from Santa Clara County and the Valley proper, where the great first and second generation tech companies started, up through Palo Alto and Menlo Park in San Mateo County, and more recently, towards San Francisco proper.
Prior to the Season 3 finale your appearances were confined to flashbacks (on account of David being dead and all).   Brazil, with a population of almost 200 million is the most populated country in South America.
Urban Slums. Massive Urban Slums in Developing Countries. A view of the Rocinha favela, the largest favela in Brazil, with an estimated 60,000 to 150,000 people December 5, 2009 in Rio de Janeiro, Brazil. It is estimated that there are over 1,000 favelas in Rio where violent crime is rampant.assive Urban Slums in Developing Countries. A view of the Rocinha favela, the largest favela in Brazil, with an estimated 60,000 to 150,000 people December 5, 2009 in Rio de Janeiro, Brazil.