“…To meet these conflicting objectives, durability and degradability should be incorporated into the material design . Here, durability, including water resistance, could be achieved by using reinforcing conjoined polymer networks, such as gelatin/chitosan, , using a covering of viscous materials made from honey, or incorporating hydrophobic materials, − for example, beeswax, − carnauba wax , or candelilla-wax, into gelatin, , starch, , agar, or casein . The decomposition functions can be designed by incorporating materials with stimulus responsiveness to pH, light, temperature, or electromagnetic fields , as well as to dynamic wettability changes.…”