Photo: Deep Cold Biological Samples In Space

NASA astronauts Tracy Caldwell Dyson (right) 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. high res (1.7 M) low res (93 K)

NASA astronauts Tracy Caldwell Dyson (right) 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. high res (1.7 M) low res (93 K)