Ok, as I understand it we have no way to determine the speed which we are moving at in an absolute sense.<BR><BR>We can say "We are moving 20 miles per hour in the car relative to the road" or "The ...

There’s no such thing as a complete vacuum. Even in the cosmic void between galaxies, there’s an estimated density of about one hydrogen or helium atom per cubic meter. But these estimates are largely ...

By using something called a quantum grid, scientists have found a clever way to simultaneously measure momentum and position ...