the light rays bounce off objects in the scene, and are affected by the materials they interact with. my problem here is that he assumes they also won't slow down. here we walk a lot as it is not set up well for bicycles. the book is about keeping yourself in motion. step aerobics easy is a step exercise workout for those who are new to step or who have not stepped in a while and want to jump start it again. the first statement implies that we have certain talents in life that come easy to us. 