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The code changes based on your selection. ______________________________ ______________________________ ______________________________ The code has been copied to your clipboard. Video size ____________________ width x ____________________ height pixels 0:02:25 (BUTTON) '¶ 0:00:00 /0:02:25 (BUTTON) '¶ '¶ Direct link * [44]270p | 6.9MB * [45]360p | 10.9MB * [46]720p | 62.2MB * [47]1080p | 44.4MB Share * [48]Share on Facebook * [49]Share on Twitter * [50]Share on Google+ * [51]Email to a Friend [52]See comments President Trump says his executive order stopping travel to the U.S from several countries will prevent terrorist attacks on U.S. soil. Many disagree. Forensic psychologists study the motivations and backgrounds of mass killers. A leading authority on this topic says many factors contribute to their actions. VOA's Carol Pearson reports. Your opinion [53]Show comments Loading comments... 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