Wood suffered permanent nerve damage at work and could no longer drive a ready mix concrete truck, though he could drive other trucks. He asked for a reassignment, but since the employer did not have another job for him, he was terminated. He was somewhat limited in walking and in perfoming certain work functions. He also claimed discrimination based on the fact that his injury resulted in impotence, substantially limiting him in a major life activity. Is he covered? (Wood v. Crown Redi-Mix, Inc. 339 F.3d 683 (8th Cir. 2003)