A high school student in Texas whose hobby is inventing thought he had a great idea for a project: to build his own clock. The effort landed him in handcuffs and juvenile detention on Monday, accused of making a hoax bomb. The detention of Ahmed Mohamed, 14, a student at MacArthur High School in Irving, Tex., near Dallas, generated a national furor even after the police said on Wednesday that he would not be charged as questions arose about whether he was targeted because of his religion. The episode even came to the attention of the nation’s top leaders, who...