A Northern California man dependent on an oxygen supply died Wednesday, shortly after power cuts by Pacific Gas and Electric Co. affected his home, fire officials said Friday. Robert Mardis, 67, died ...

Forward-looking: Despite being a relatively rare element, lithium is still the king of materials when it comes to rechargeable battery technology. Calcium is 2,500 times more abundant than lithium, ...

Southern California hospitals, already overwhelmed by coronavirus patients, are now facing a new problem -- a shortage of oxygen, according to a report. Officials say they're having trouble getting ...