Expedition 63 Commander Chris Cassidy prepares to stow biological samples for preservation inside a science freezer.
iss063e027945 (June 16, 2020) — NASA astronaut and Expedition 63 Commander Chris Cassidy prepares to stow biological samples for preservation inside a science freezer also known as MELFI, or Minus Eighty-Degree Laboratory Freezer for International Space Station, for later analysis.