How we communicate via today's modern technologies may be more important than ever, but do old theories of mass communication still apply? The four functions of mass communications are: surveillance, ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Sean Ross is a strategic adviser at 1031x.com, Investopedia contributor, and the founder and manager of Free Lances Ltd. Ariel Courage is an experienced editor, researcher, and former fact-checker.

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 ...

So, sometime next year you’re attending Sunday Mass as you always do, the priest takes his place in the sanctuary, makes the Sign of the Cross and says “The Lord be with you,” and you dutifully ...

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 ...

Objectives In patients with chronic obstructive pulmonary disease (COPD), severe exacerbations (ECOPDs) impose significant morbidity and mortality. Current guidelines emphasise using ECOPD history to ...