stethoscope studs | silver horizontalDNA_Upsell A biconcave disc 7-8 micrometers

A biconcave disc 7-8 micrometers across

and neurosurgeons working at L1 to L5

We see it most often as a medical-school graduation gift

Cellular neuroscientists and electrophysiologists buy it as a working reference

stethoscope studs | silver horizontalDNA_Upsell A biconcave disc 7-8 micrometersStethoscope studs sterling silver Ren Laennec invented the stethoscope in 1816 because he couldn't bring himself to press his ear directly to a patient's chest. His wooden tube became the defining symbol of medicine, and it has never lost that meaning. The Science Behind the Stethoscope Laennec's insight was that sound travels better through a confined medium than through open air. His paper tube channelled vibrations from the chest wall into the