Scientists have long embraced the fact that forces beyond sight govern the universe. Dark matter, they think, holds galaxies together with extra gravity, and dark energy drives the universe’s ...

In January I wrote a piece titled “5 Physics Equations Everyone Should Know.” Lots of you weighed in with your own nominations, and there were plenty of good suggestions. So I’ve decided to do a ...

Introduction and aims: Infarcted brain tissue on non-contrast computed tomography (NCCT) causes hypodensity resulting from vasogenic edema. It is unknown if hypoperfusion outside of the ischemic core ...