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Anant Agarwal, president of edX, an online learning platform, speaks at the Massachusetts Institute of Technology in Cambridge, Mass., Monday, March 3, 2014 about "Big Data Opportunities for Improving Online Education." MIT has teamed up with the White House to host a conference on how to maintain privacy in the digital era and discuss ways to protect privacy as technology continues to evolve. (AP Photo/Elise Amendola)

Anant Agarwal, president of edX, an online learning platform, speaks at the Massachusetts Institute of Technology in Cambridge, Mass., Monday, March 3, 2014 about "Big Data Opportunities for Improving Online Education." MIT has teamed up with the White House to host a conference on how to maintain privacy in the digital era and discuss ways to protect privacy as technology continues to evolve. (AP Photo/Elise Amendola)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.