A Baltimore County, Md. middle school was put on lockdown today after a student pulled a gun out in a classroom. Reportedly, the teacher stepped between him and another student and was subsequently able to get the student to drop the gun.
An array of invisibility cloaks have been created in order to slow down and even stop light. This technique, known as "trapping a rainbow" can be used in a variety of fields from medicine to camouflage.