With the ability to sense changes in pH, temperature and oil, this completely soft robot dubbed "DraBot" could be the prototype for future environmental sentinels. Credit: Vardhman Kumar ================================================================= Engineers at Duke University have developed an electronics-free, entirely soft robot shaped like a dragonfly that can skim across water and react to environmental conditions such as pH, temperature or the presence of oil. The proof-of-principle demonstration could be the precursor to more advanced, autonomous, long-range environmental sentinels for monitoring a wide range of potential telltale signs of problems. The soft robot is described online March 25 in the journal Advanced...