If you’ve ever accidentally superglued your fingers together, you know firsthand (so to speak) that adhesive forms powerful bonds with materials.  When it happened – a self-gluing accident happens to everyone eventually – you probably did a little Internet research (which was itself a challenge since you’d only eight or so unstuck fingers with which to type) and found out that superglue dissolves away with the application of a little acetone.  I bring this up to highlight a fundamental law of gluing: sticking two things together is useful; being able to unstick as them as needed is even more useful.  To that end, General Motors researchers have created an …