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2 results for “heart”.

• What Your Blood Pressure Numbers Actually Mean
  "120 over 80" is one of the most quoted health numbers there is, and almost no one is told what the two figures really measure. Blood pressure is a live reading of the force your heart exerts on your arteries — and understanding the two numbers turns a scary reading into useful information.
• The Doppler Effect: How Motion Changes Everything You Hear — and See
  The drop in pitch of a passing ambulance siren is the same physics that finds exoplanets, measures heart blood flow, and proved the universe is expanding. One everyday sound hides four centuries of the most useful trick in science.