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Executives from Facebook, Google, Amazon and Apple are set to testify at an antitrust hearing on Capitol Hill in what promises to be the most high-profile grilling session so far this year over the growing market power of Silicon Valley's biggest companies. CNN's Brian Fung reports.

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From singing to golfing to Galileo, Apollo astronauts enjoyed lighter moments on the moon while on their official mission of scientific exploration. Here are other memorable moments beyond Apollo 11. Watch the TV premiere of 'Apollo 11' on Sunday, June 23 at 9 p.m. ET/PT.

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After Neil Armstrong and Buzz Aldrin's successful 1969 moon landing, President Richard Nixon placed a very long-distance phone call to the astronauts. For more, watch CNN Films' "Apollo 11" on Saturday, July 20 at 9 and 11 p.m. ET.