Natalie Jeremijenko -- an artist working at the intersection of contemporary art, science and engineering, and named one of the Top 100 Innovators by the MIT Technology Review -- holds office hours on the East River of New York City. Yes, ON the river: her environmental health clinic, a floating desk and research station, is built out of recycled soda bottles -- and a conviction that environmental health ills are best investigated as close to their source as possible. Visitors come away "not with a prescription for pharmaceuticals but for actions," notes Jeremijenko.