Martin Starr plays software designer Gilfoyle in the HBO comedy Silicon Valley. In the show's new season, Gilfoyle and his fellow techies attend a startup competition named "Disrupt." Frank Masi/HBO hide caption

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Hillary Clinton begins to speak as her husband, former President Bill Clinton, moves to take a seat after introducing her at the Clinton Global Initiative on Sept. 22, 2014, in New York. Mark Lennihan/AP hide caption

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President Obama, seen shaking hands with Raul Castro at the Summit of the Americas in Panama, engaged in the first substantive face-to-face U.S.-Cuba talks in more than 50 years. Scott Horsley/NPR hide caption

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Marco Rubio celebrates onstage with his family in 2010 after winning his U.S. Senate seat in Florida when he was just 39 years old. Now, he's expected to embark on a run for president. Alan Diaz/AP hide caption

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As the new season of Game of Thrones begins, Tyrion Lannister (played by Peter Dinklage) is on the run after killing his manipulative father. HBO hide caption

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The times, they may be changing — but the cast of AMC's Mad Men find it difficult to change with them. Frank Ockenfels /AMC hide caption

itoggle caption Frank Ockenfels /AMC