Ashton Eaton

You see somebody on a football field make a great, athletic 70-yard run, but the athleticism is immeasurable. It's undoubtedly athletic, but compared to somebody else who did something else, how do you compare it? That's the great part of track and field. It's a test, but with results that you can compare to others.

The closer I get to retirement, the more I feel it will be a huge change, a shock, because athletics has been the core of my whole life. I know I'll miss the feeling of running fast, the adrenaline rush, and hearing the crowd cheering me on.

Innate mechanisms endow the visual system with highly specific connections, but visual experience early in life is necessary for their maintenance and full development. Deprivation experiments demonstrate that neural connections can be modulated by environmental influences during a critical period of postnatal development.