RICHARD PRIDEAUX / SCIENCE PHOTO LIBRARY RICHARD PRIDEAUX / SCIENCE PHOTO LIBRARY
Urban stress. Conceptual image representing the stress of city living. An electrocardiogram (ECG) trace showing an abnormal heartbeat, and an image of a stethoscope (green) are superimposed on images of city commuters. A stethoscope is used to listen to the heartbeat, while an ECG is obtained using electrodes to detect the electrical activity of the heart muscle.
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