Usain Bolt brings light to a sport in peril
![Usain Bolt brings light to a sport in peril](http://bloximages.chicago2.vip.townnews.com/tdn.com/content/tncms/assets/v3/editorial/9/0a/90ad4251-ab57-5082-a5d0-e11e92882e9c/579d9b2cf38ca.image.jpg?resize=300%2C213)
Since he coasted to the 100-meter finish line in world-record time at the Bird's Nest eight years ago, Usain Bolt has been the smiling face of track and field. He has served as the anchorman of the Olympics — virtually…