by replacing air with acetone you will see how the blue turns to green and as the acetone evaporates, air comes back and the blue colour returns. >>reporter: it may be an obvious model for sustainability and efficiency but until now the natural world has largely been ignored by the commercial one. but that's changing. bmt defence services, which specializes in naval design and engineering, has formed a symbiotic relationship with its neighbour, the university of bath and together they are coming up with some fascinating new technology. >>quilliam: underwater animals, tend to fish in the light, tend to be very quiet as well as being energy efficient, so you can see the defence applications in terms of stealthiness, in terms of energy efficiency,in termsoft on returning to port, returning to a home vessel; being very attractive. >>megill: best propellers there are, are about 70 percent efficient - power in, thrust out - fish on the same scale are 95 to 98 percent efficient. so you're able to generate a whole lot more efficient use, nowconvert that into a motor design and you've got less

>> the acetone will eat through the finish.rs because they don't have the polyurethane finish on them. >> something you can use with lomb natured floors, not wood floors. what would you do with this if it was on a carpeted floor? >> i don't think you should use acetone on a carpeted floor either. you would probably want to use a carpet cleaner or something like that. >> you have to go out and buy the carpet cleaner. >> yes. >> but this will also work on ink stains. anything that would have some kind of solvent in it so it dries really quickly, ink, marker, paints, things like that. this is the cure for that. >> alex, we so appreciate it. thanks so much. now here's russ. >> okay, rebecca, thank you very much. up next, ask dr. debbye. advice and answers from dr. debbye turner bell for those burning pet questions. you are watching "the early show" on cbs. [ thinking ] oh, gourmet deliciousness... i want you tonight! [ female announcer ] wish granted. lean cuisine has a fresh new bag. lean cuisine market creations steam meals. like