"ROBOTS: Flying robotic insect slated to explore Mars"
Motivated by the notion that the Mars landscape may prove easier to navigate by air than with ground-based rovers, NASA is backing a research project to build toy-sized flying robots, modeled on the entomology of insects, that can hover like helicopters. Patented as "entomopters," the robots are on the drawing board of University of Missouri professor Kakkattukuzhy Isaac.
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Story in EE Times: http://www.eetimes.com/story/OEG20020114S0081