30.5 MB (1.6 MB compressed)
3966 x 2686 pixels
33.5 x 22.9 cm ⏐ 13.2 x 9.0 in (300dpi)
BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
Acupuncture needles. When inserted at acupuncture points in the body they are believed to cause the release of natural painkillers called endorphins within the central nervous system.
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