Researchers say they have discovered an entirely new class of life inside the human body, and it is very similar to a virus.

A private medical transport plane crashed in Philadelphia on Friday evening. Several homes are engulfed in flames. CBS News transportation safety expert and analyst Robert Sumwalt has more.

Hyperkalemia, which can induce signs of a heart attack or paralysis and weakness of the muscles, is defined as a level that is higher than 5.0-5.5 mEq/L.

Space travel affects the human body in unexpected ways. Scientists now highlight a growing concern—eye health.