The U.S. Coast Guard recently conducted a marine casualty investigation into an uncontrolled release of isobutane from a ...

During a routine physical in 1965, Philip Bryson learned that he had a life-threatening heart murmur. Follow-up exams revealed that he'd been born with a defective aortic valve, and at age 25, the ...

The four valves of the heart allow blood to flow through the heart in the right direction. The valves open or close each time the heart beats. Problems with the heart valves can lead to palpitations, ...