Energy efficiency and balancing is one of the primary challenges for wireless sensor networks (WSNs) since the tiny sensor nodes cannot be easily recharged once they are deployed. Up to now. many energy efficient routing algorithms or protocols have been proposed with techniques like clustering. data aggregation and location tracking etc. https://www.spidertattooz.com/The-GelBottle-Inc-Gel-Polish-Cashmere-67oz-p20053/