A new method for filtering light coming from a specific direction

Using only material geometry and interference patterns, MIT researchers have devised a novel way of passing light of any colour only if it comes from a specific angle. Light coming from other directions will be reflected, something which can be desirable in certain applications. Those who could benefit immediately from the findings are solar photovoltaics, detectors for telescopes and microscopes, and

Why do zebras have stripes? To ward off blood-sucking insects

The leading theory that explains why zebras are striped (remember the age old riddle? black stripes on white or white stripes on black?) is because it offers them protection against predators, by providing camouflage, as colour blind animals confuse the strips with tall grass in the savanna. A team of researchers from Hungary, however, offer a different, scientific take regarding the development