||Top paragraph: "Athletics sprint events begin with a sequence of events: Gun goes off  Sound travels from gun to ear  ear registers sound, sends impulse to brain  brain processes sound, sends signal to start running.  signal is received by muscles: sprinter goes. Except for step 1, these events are loosely described as the athlete's reaction time. Major meets conducted by the IAAF record reaction times, and usually publish them on their web-site. When athletics sprint events separate athletes and world records by hundredths of a second, it's worth appreciating the magnitude of the start events and particularly to consider their impact on timing accuracy."