Major stock indexes fell, with investors unsettled by a note of caution in Walmart's forecast. Big bank stocks fell sharply despite no clear news catalyst, which some analysts attributed to economic ...

Small planes crash all the time, but commercial airline crashes are a whole other story. In fact, there had been no major U.S. commercial passenger airline crashes with fatalities between Feb. 12, ...

This results in the P waves (atrial depolarizations) being completely unrelated to the QRS complexes (ventricular depolarizations) ― meaning the P waves occur at one rate and the QRS complexes ...