If there's such a thing as bike karma, Kenneth Walker has it. Last summer, the urban cycling advocate woke up to find a pair of shiny new bikes on his front porch, with nothing but an appreciative note from an anonymous supporter encouraging his work with inner-city kids. This week, the cycling fairy struck again. Walker received an unexpected phone call from New Jersey-based Sanofi-Aventis, a pharmaceutical company with 16,000 employees nationwide.
