/*Discovery*/ will be bringing back five months' worth of science experiments from the space station. The blood, urine and saliva samples need to be kept cold for as long as possible, and will remain in the station freezer until the last possible moment.
The shuttle also is bringing back four to five liters of recycled water made from astronauts' urine and condensation. NASA wants to make sure the water is safe before space station astronauts start drinking it up there.
Discovery and its crew of seven are due back in Florida on Saturday.
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