An illustration of the ultrathin "invisibility" cloak. Light reflects off the cloak (shown by the red arrows) as if it were reflecting off a flat mirror. In the movie "Predator," an alien uses a ...

To make a Harry Potter-style invisibility cloak requires the use of materials that have what's known as a negative refractive index over all optical wavelengths, from red to violet. However, the ...

Scientists might be a step – a teeny tiny step – closer to developing that Harry Potter-style invisibility cloak of your dreams. Researchers at UC Berkeley have created a thin metamaterial that can ...

It's often a case of swings and roundabouts. If you save money by buying a house out of town, you spend more time and money commuting. If you really measure the momentum of an electron, you have no ...