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 ...

That’s according to a Marine Administrative message published this month. According to the message, female officers and staff ...

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 ...

What do Harry Potter's invisibility cloak and stealth fighter jets that evade radar have in common? They both make objects ...

What do Harry Potter's invisibility cloak and stealth fighter jets that evade radar have in common? They both make objects invisible despite their ...

In the movie "Predator," an alien uses a cloaking device to hide in plain sight, but the effect is far from perfect: The alien's attempt to conceal itself is thwarted by distortions of light bending ...