four captioned diagrams of the functioning of an organ in the human inner ear's vestibular system
NASA
<a rel="nofollow" class="external text" href="http://weboflife.nasa.gov/learningResources/vestibularbrief.htm">The Effects of Space Flight on the Human Vestibular System</a>, an online educational article by the U.S. government’s National Aeronautics and Space Administration (NASA) und im Archiv <a rel="nofollow" class="external autonumber" href="https://archive.ph/gm7h">[1]</a>