Zac Vawter

Zac Vawter practices climbing stairs using a bionic leg at the Rehabilitation Institute of Chicago on Friday. On Sunday, Vawter will try to climb 103 stories to the Skydeck of Willis Tower.

( Zbigniew Bzdak, Chicago Tribune )

Zac Vawter practices climbing stairs using a bionic leg at the Rehabilitation Institute of Chicago on Friday. On Sunday, Vawter will try to climb 103 stories to the Skydeck of Willis Tower.

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