The iris is a circular, pigmented membrane that provides the eye its color and the opening in the center is the pupil of the eye.
The iris is made up of muscular fibers that control the amount of light entering the pupil so that you can see clearly. The iris accomplishes this task by making the pupil smaller in bright light and larger in dim light.
Blake Mycoskie first glimpsed global poverty while a contestant on CBS's The Amazing Race, zooming around the world in 2002 with his sister, Paige, (they finished third on the reality game show). But it wasn't until a vacation to Argentina in 2006 that the Texan was hit with the need to do something about it.
A brief volunteer venture, traveling from village to village to dole out donated shoes to barefoot children, lit a fire in Mycoskie's heart. As he explains in his new book, Start Something...