In this photo taken Oct. 16, 2012, Austin Benavidez, who is blind, practices his tennis serve using an oversized ball filled with ball bearings at the California School for the Blind in Fremont, Calif. Students at the school are learning to play tennis, and expanding the boundaries of what the blind can do while offering new insights into the human mind. They must turn their ears into eyes, listening for the ball's bounce to figure out where to swing their rackets. (AP Photo/Ben Margot)

Associated Press
In this photo taken Oct. 16, 2012, Austin Benavidez, who is blind, practices his tennis serve using an oversized ball filled with ball bearings at the California School for the Blind in Fremont, Calif. Students at the school are learning to play tennis, and expanding the boundaries of what the blind can do while offering new insights into the human mind. They must turn their ears into eyes, listening for the ball's bounce to figure out where to swing their rackets. (AP Photo/Ben Margot)
In this photo taken Oct. 16, 2012, Austin Benavidez, who is blind, practices his tennis serve using an oversized ball filled with ball bearings at the California School for the Blind in Fremont, Calif. Students at the school are learning to play tennis, and expanding the boundaries of what the blind can do while offering new insights into the human mind. They must turn their ears into eyes, listening for the ball's bounce to figure out where to swing their rackets. (AP Photo/Ben Margot)
View Comments (27)