“I just want to say one word to you. Just one word,” said the businessman Mr. McGuire to Dustin Hoffman’s character Benjamin in The Graduate, who had recently completed his college education. That word, of course, was “plastics” and it was offered to Benjamin as a sort of career advice: plastics are going to be big. At the time the film was released in 1967, it would have been hard to foresee just how right Mr. McGuire would be. Plastics are literally all around us. They are often within us, too, in the form of everything from dental polymers to PEEK spinal implants.