"Gravity's Ghost and Big Dog" brings to life science's efforts to detect cosmic gravitational waves. These ripples in space-time are predicted by general relativity, and their discovery will not only demonstrate the truth of Einstein's theories but a...

Much of what humans know we cannot say. And much of what we do we cannot describe. For example, how do we know how to ride a bike when we can't explain how we do it? Abilities like this were called "tacit knowledge" by physical chemist and philosophe...

In theory, at least, gravitational waves do exist. We are constantly bathed in gravitational radiation, which is generated when stars explode or collide and a portion of their mass becomes energy that ripples out like a disturbance on the surface of...