Scientists from Penn State University recently engineered a new kind of glue that rsquo s both extremely strong and also removable Their design is inspired by a snail whose slime hardens in dry conditions and loosens again when wet The reversible nature of the snail rsquo s slime allows it to move freely in more humid conditions mdash safer for the snail mdash while keeping it securely planted in its environment when movement would be hazardous The researchers rsquo approach of mimicking an adhesive found in nature calls to mind scientist Johannes Kepler rsquo s description of his discoveries He [... more]