NASA Astronaut Reid Wiseman explains what it was like to conduct a spacewalk outside the International Space Station to visitors at the Maryland Science Center in his hometown, Baltimore, Md. on Wednesday, February 11, 2015. Wiseman served on Expeditions 40 and 41 with Maxim Suraev of the Russian Federal Space Agency (Roscosmos) and Alexander Gerst of ESA (European Space Agency) and returned home in November 2014. (Photo Credit: NASA/Aubrey Gemignani)

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