A very enjoyable romp through the science of how we human develop & maintain our balance - a surprisingly complex task that still eludes the most advanced 2-legged robots. With humor and wit, Carol explains the complex set of sensorimotor control systems that integrate sensory input from vision (sight), proprioception (touch), and the vestibular system (motion, equilibrium, spatial orientation) to actuate the equally complex set of muscles to make our everyday movement seem effortless. Along the way, she explains why motion sickness occur (sensory input conflict theory), how infrasonic sound (below human audible frequency) like those emitted by wind turbines make us sick, how alcohol makes us tipsy (by diluting the fluid in our vestibular chamber), and why "choking" occurs even to the seasoned sportsman. A timely read especially for someone my age, as I begin to cope with the reality that my ability to balance will continue to degrade as I age, but also heartened to learn of how recent scientific advances (exoskeleton design, light touch theory) will help.