For the first time ever, physicists have mapped the path that particles are most likely to take when moving from one quantum state to another. In physics, a concept called the "path of least action" ...

This week, the federal Department of Homeland Security is testing just how many subway riders would be at risk in a nightmare scenario: terrorists releasing a deadly biological agent in the subways.

Researchers from the University of Copenhagen have discovered a surprising phenomenon in a process by which certain gas molecules produce harmful particles. The impact of this phenomenon is likely to ...