REUTERS/Handout . An undated handout photo provided by the Swiss Federal Institute of Technology (EPFL) May 31, 2012, shows a researcher observing a rat walking on its hind legs during an experiment ... more 
REUTERS/Handout . An undated handout photo provided by the Swiss Federal Institute of Technology (EPFL) May 31, 2012, shows a researcher observing a rat walking on its hind legs during an experiment at the Center for Neuroprosthetics and Brain Mind Institute in Ecublens. less 
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Sun, Jun 3, 2012 2:00 PM EDT