Neuronal signaling. To support the general function of the nervous system, neurons have evolved unique capabilities for intracellular signaling (communication within the cell) and intercellular signaling (communication between cells).
Because of this, gyroscopes are useful for measuring or maintaining orientation. Invention History. The gyroscope was invented in 1852 by the French experimental physicist Leon Foucault (1819-1868) as part of a two-pronged investigation of the rotation of the earth.
Medical students listening to their heartbeats using a multiple stethoscope, c.1920s. Credits:Wellcome Library, London. RenÃ© Laennec invented the stethoscope in 1816. While consulting a female patient, Laennec needed to listen to the womanâs chest. Before the stethoscope, doctors would place their ear directly onto the patientâs chest, a practice called auscultation.