Graeme Milton and colleagues have come up with a theory for how small objects could become invisible. Such technology remains far off, but it may not be entirely impossible. Teams of scientists around the globe say they’re making progress on theories and experiments involving cloaking. In theory, all that’s needed to make a small object invisible is something called a superlens, Graeme Milton said, a mathematician at the University of Utah. He and Australia-based collaborators Nicolae Nicorovici, Lindsay Botten and Ross McPhedran have made mathematical models showing that at a critical distance from a superlens, an object would seem to disappear. A superlens has a negative refractive index, meaning light that hits it reverses and goes in the opposite direction. Physicist John Pendry at Imperial College London was among the first to propose superlenses in 2000. At a certain distance from a superlens, an object becomes invisible because light that bounces off it cancels out with light reflecting off the superlens. It’s a little like noise cancellation devices such as earphones. This is WOW discovery, hearing this giving us an expectant heart that nothing is impossible with arising technology.