55 points | Friends and family members expressed shock when 21-year-old college student Luke Helder was arrested in connection with a rash of 18 pipe bombs planted in rural mailboxes in five states. (His father notified the FBI after reading death threats and anti-government comments in recent letters.) The U.S. attorney in Cedar Rapids, Iowa, charged the young man with using an explosive to maliciously destroy property affecting interstate commerce, as well as using a destructive device to commit a crime of violence, charges that could send him to prison for life. Luke Helder told one Nevada officer that he was trying to create a smiley face with his bomb placements, with the two eyes being the first bombs planted in Illinois and Iowa, and the smile swerving from Colorado to Texas, where his last bombs were located before his arrest. Copycat incidents were reported in eastern Indiana, Charlottesville, Va., and Spokane, Wash.