Novel material can change under the right light, to be either strong or self-healing

Neat trick.

Self-healing bioplastic stitches itself back together when water is added

When your plastic device breaks, there’s basically nothing else to do but shrug, try to glue it then go on with your life. But wouldn’t it be useful if the plastic itself could fix itself? Let me illustrate with the latest creation to come off the Pennsylvania State University lab: a bioplastic containing a novel mix of proteins derived from squid sucker ring teeth that can fuse back together when water is added. Once its ‘healed’, the bulk bioplastic return to its previous compression and tensile strength, so its not fragile.