Natures are working at nano level far before scientists knew about it. Water repellent plant gives us the idea to make water repellent fabric.
Complex molecule called polymer is coated over normal fabric and heated until the polymer bonded with the fabric. This coating implants nano whiskers over the fabric so liquid cannot touch it. Thus we get our water repelling fabric just like the plant.
Though many unknown remains in the world of nanotechnology its ability to work at nano level can potentially revolutionize the world.
Nanotechnology in Nature
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