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I saw my heart on a monitor today. It was beating away, keeping me alive. I got to watch the red, blue, and yellow flashes of my blood flow while Emily, the technician, took still photos to show my cardiologist. Green doesn’t mean go here, and red doesn’t mean stop. Red and blue are indications of speed and tell Emily  if the blood is flowing towards her or away. It’s mostly all red and blue, but the flashes of yellow are where the blood is flowing fastest, speeding through the valves of my hea...