A GPS that gets you there by the most fuel efficient route, a mass extinction of fish that paved the way for human evolution and a nose that can smell bacterial infections are just three of the science stories we're keeping an eye on in tonight's installment of Scientific Chicago.

More on the Story: Read an interview with the scientist who developed the noseWatch more Scientific Chicago segments More on the mass fish extinctionThe Fermilab MINERvA experimentEndeavor experimentMore on smelling bacterial infections