One of the teams researchers described the squid beak as, "like placing an X-Acto blade in a block of fairly firm Jell-O and then trying to use it to chop celery." — illustrating just how bizarre this appendage appears to be. Careful examination shows the beak itself is actually formed in a gradient of density, becoming harder out towards the tip of the beak.
Understanding this gradient relationship may revolutionize Engineering, anywhere "interfaces between soft and hard materials [are required]." One of the first applications researchers imagine would be in Prosthetic Limbs."