Stock Photo - NASA astronauts Tracy Caldwell Dyson (background) and Shannon Walker, both Expedition 24 flight engineers, prepare to insert biological samples in a dewar tray in the Minus Eighty Laboratory Freezer for ISS (MELFI-1) in the Kibo laboratory of the International Space Station.

Stock Photo: NASA astronauts Tracy Caldwell Dyson (background) and Shannon Walker, both Expedition 24 flight engineers, prepare to insert biological samples in a dewar tray.

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