Hamza notices that symetrical, slender shapes with smooth curves move faster through air. If a shape is not aerodynamic, drag and turbulence make it harder for them to move through air.  The Investigators find streamlined objects designed to move efficiently through air: speedboats, bicycle helmets, and birds. Marc Garneau demonstrates the aerodynamic difference between flat and conical shapes. Streamlined shapes can also be hydrodynamic for things moving through water, like dolphins or penguins.