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This is mission control Houston.

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The clock is counting
down on the last few days

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of the International Space
Station's Expedition 33,

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where three crew members
are getting ready to return

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to Earth this weekend after
more than four months in space.

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Station commander Suni Williams

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and Flight Engineers
Yuri Malenchenko

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and Aki Hoshide will depart
the soace station this Sunday

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afternoon at 4:26 p.m. Houston
time for a landing in Kazakhstan

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that will come just before
8 p.m. in the evening.

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On Thursday, all three of them
continued their daily exercise

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sessions to keep in shape to
be better prepared to deal

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with the one gravity environment

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that they are about
to reencounter.

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For Malenchenko, he
also started a session

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with the Russian protocol known

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as a lower body negative
pressure.

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He wears an inflatable
suit that uses air pressure

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to simulate gravity by
pulling all of his legs.

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He wears that while
exercising.Malenchenko also

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supervised the continued
packing of the Soyuz vehicle

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that he will command
on the return trip.

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Hoshide spent time
today in exercise

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for the Sprint investigation
looking to find

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out if high-intensity exercise
in shorter spurts is better

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in fighting bone and muscle loss

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than long sessions
of moderate exercise.

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He also worked with Williams

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to replace a remote
power controller module

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in the Quest airlock.

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Kevin Ford had time
today to change out water

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in the enclosure for the Medaka
fish, which is being used

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as a analog for human
beings in an investigation

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into bone loss during an
extended stay in microgravity.

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He later assisted the Suni
Williams in fixing a leak

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in the carbon dioxide removal
assembly, which is part

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of the air revitalization
system on the station,

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and then installed new
radiation area monitors.

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Flight Engineers Oleg Novitskiy

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and Evgeny Tarelkin completed
a Russian public affairs event

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and both worked on
Russian science

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with Tarelkin helping
Malenchenko

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with the lower body
negative pressure exercise,

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and Novitskiy also working
on transfers in and out

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of the Progress vehicle.

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Williams and Ford are
planning to take part

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in an educational event with
students at the National Air

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and Space Museum,
coming up this morning,

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and all the crew members will
then wrap up their days work

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as they continue to prepare
for the departure of Williams,

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Malenchenko and Hoshide
and the start