In 1956, while building an oscillator to record heart sounds, Wilson Greatbatch inadvertently installed a resistor with the wrong resistance. It began to pulse at a steady pace—a sound similar to that ...

Your heart has an internal pacemaker called the sinus node. It's a group of cells, located on top of your heart, that sends electrical signals into the heart and controls your heartbeat. Sometimes, ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Danish professional soccer player Christian Erikson has been fitted ...