I'm always fascinated by the goodness that manifests from mimicing nature. We've been able to model the extreme strength of spider silk; in fact assembly line manufacturing could be linked to the workers in an ant colony or the drones in a bee hive.
Now some smart people have modeled the adhesive properties of the Gecko (not the Progressive one). Nature is absolutely amazing. I wonder if we'll ever be able to model the color changing behavior of the chameleon?
What would we do without engineers :)