Credit: Dave Bradley

As always, Technology Review's annual list of emerging technologies to watch comprises projects in a broad range of fields, including medicine, energy, and the Internet. Some, such as optical antennas and meta­materials, are fundamental technologies that promise to transform multiple areas, from computing to biology. Our reports on peer-to-peer video, personalized medical monitors, and compressive sensingreveal how well-­designed algorithms could save the Internet, simplify and improve medical diagnoses, and revamp digital imaging systems in cameras and medical scanners. Nanohealing and quantum-dot solar power demonstrate the potential of ­nanotechnology to make a concrete difference in our daily lives by changing the way we treat injuries and helping solar energy deliver on its promises. Precise neuron control could help physicians fine-tune treatments for brain disorders such as depression and Parkinson's disease. And single-cell analysis could not only revolutionize our understanding of basic biological processes but lead directly to predictive tests that could help doctors treat cancers more effectively. Finally, by combining location sensors and advanced visual algorithms with cell phones, mobile augmented reality technology could make it easier to just figure out where we are.

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