Tachyons might sound like creatures ripped out of a George R. R. Martin novel, but the reality is that they refer to as-yet-non-existent particles not only capable of travelling faster than the speed ...

There are three possible outcomes if a needle somehow traveled at a speed of more than 670 million mph and hit our planet ...

Since optical analog computing devices are passive—that is, they do not need electrical power—almost no energy is consumed, and moreover, the operation is literally done at the speed of light.