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 nose
• Watch more Scientific Chicago segments
• More on the mass fish extinction
• The Fermilab MINERvA experiment
• Endeavor experiment
• More on smelling bacterial infections