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Sensors when interspersed in our structures and ambient environment coupled with efficient relay of the sensed data could provide numerous advantages to the society. Tedious tasks like monitoring a field or sensitive ones like keeping track of an endangered species can be automated through a system of coherent sensors. Wireless sensor networks (WSNs) are self-organized network consisting of such sensors coupled with a radio unit. The nodes, powered by batteries, have limited computation capabilities. Most applications of WSNs require deployment in unattended remote locations. Therefore, power awareness is fundamental to data dissemination and routing in a WSN.