In a popular comparison: an art heist takes place in a crowded museum--before your eyes and surveillance cameras. you don't see the thief, not even the actual taking of the painting. The opportunities would be staggering...and scary, but this is exactly what scientists at Cornell U are claiming to have done. Not the actual heist, but creating a time cloak that hid an event for 40 trillionths of a second.
While other invisibility cloaks created move light beams away from an object (like making an armored tank disappear or nanotubes creating a mirage), the Cornell team (backed by the Pentagon) found a way to alter how fast the light moves, changing the dimension in time, not space. By doing this, it makes it appear to the human eye or surveillance cameras (or even laser security beams) that an event isn't happening.