Invisibility,...sort of

Yes invisibility does exist. There is technology that can make things invisible by relying on metamaterial and nanotechnology (metamaterial, an emerging technology will be discussed here later in the semester). These materials required a lot of finessing and if made exact enough and at certain angles and light wavelengths, objects behind them disappear.
Now there is a new technology that does not rely on this fabricated material. Researchers from MIT (University of Birmingham, London's Imperial College and Denmark's Technical University also) are using a natural occurring material called calcite to build a carpet cloak. The cloak refers to a device that makes an object invisible. The bottom of the calcite is notched with triangles, or made into two triangles and glued together, which from some angles will appear as a flat plane, but is actually more like a bent mirror. The light enters the calcite and is actually going in different directions at different speeds, resulting in the object being rendered invisible. The optical quality of the calcite will hide any object that is behind the notch or behind the triangles. As you know objects are seen by light being reflected off their surfaces, the calcite has properties that bend light waves. The cloak itself can be seen, but the object behind it is not.
http://factoidz.com/invisibility-cloak-scientists-make-objects-disappear-from-view/http://www.wired.com/wiredscience/2011/02/invisibility-calcite-crystals/