Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. Since 2006, guns have been used in an average of 25 mass killings per ...

Shooters often kill people who are, or presumably once were, close to them. 25 percent killed a parent, child or stepchild, and 23 percent killed a current or former romantic partner. Even some large ...

Deleting your Facebook doesn't require jumping through hoops, but you don't want to leave your data behind when you log out for the last time. Jen Karner has spent the last 10 years covering ...

Mass spectrometry is an analytical technique that uses an instrument called a mass spectrometer to measure the mass-to-charge ratios of molecular ions. Molecules fragment within the mass spectrometer ...