The dub ( diastolic sound) occurs when part of the heart relaxes and the aortic and pulmonary valves close. A heart murmur is an extra sound, such as a whooshing, caused by irregular blood flow through the heart valves. Heart murmurs can be heard through a stethoscope and are often detected during routine physical examinations. If your heart murmur is related to more serious problems, your doctor may refer you to a cardiologist (heart specialist).
On July 20, 1969, Apollo 11 astronaut Neil Armstrong became the first man to walk on the moon. Armstrong is pictured here, shortly after collecting a sample of lunar dust and rocks. At his feet is the handle for the sample collection tool.
Aldrin went in first and Armstrong transferred up to him the lunar samples and the film packs. At 1:09 A.M. EOT, Armstrong climbed the ladder and went through the hatch. Two minutes later, the hatch was secured. Armstrong had walked on the moon for 2 hours, 31 minutes and 37 seconds; Aldrin roughly 40 minutes less.