White phosphorus is a wax-like chemical substance that ignites spontaneously when exposed to oxygen. It burns at extremely high temperatures and continues to burn as long as it is exposed to air.

DEAR DR. BLONZ: I have a question concerning recommended servings of foods, how they have been determined over the years and the confusion with food labels. It can be unclear when checking serving ...

There was a significant mechanical problem before a deadly police helicopter crash that happened during a shootout last month in Flagstaff, a preliminary report says.