Robots promise to transform our lives in myriad ways. Having already revolutionized the production line, robots are getting smarter, smaller and more capable, and they're walking, rolling and flying out of labs and into homes and businesses at an astonishing rate. With the ability to perform tasks that are considered too menial or impossible for humans, robots are destined to make many aspects of our lives easier. Will they ultimately supplant us? We'll just have to wait and see.

A team of engineers at Cornell has built a robotic fish powered by electric blood, which not only serves as an energy source, but acts hydraulically to create propulsion as well. This bio-inspired approach addresses one of the great challenges for small, untethered robots – mass vs. power.
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