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University of Utah scientists used invisible infrared light to make rat heart cells contract and toadfish inner-ear cells send signals to the brain. The discovery someday might improve cochlear implants for deafness and lead to devices to restore vision, maintain balance and treat movement disorders like Parkinson's

Not all research papers receive their own hashtag on Twitter. But #arseniclife (as it was dubbed in tweets) was no ordinary paper.

Zooniverse volunteers, who call themselves "Zooites," are working on a project called Galaxy Zoo, classifying distant galaxies imaged by NASA's Hubble Space Telescope. "Not only are people better than computers at detecting the subtleties that differentiate galaxies, they can do things computers can't do, like spot things that just look interesting," explains Zooniverse director Chris Lintott, an astronomer at the University of Oxford.