in this paper, we are concerned with the networking and applications challenges presented by this radical new technology. These kinds of networking nodes must consume extremely low power, communicate at bit rates measured in kilobits per second, and potentially need to operate in high volumetric densities. These requirements dictate the need for novel ad hoc routing and media access solutions. Smart dust will enable an unusual range of applications, from sensor-rich “smart spaces” to self-identification and history tracking for virtually any kind of physical object.