Mars Experiment Crew 'Returns to Earth'  Six volunteers in
matching blue flight suits emerged from behind a steel hatch
this afternoon at Moscow's Institute for Biomedical Problems,
smiling from ear-to-ear after spending the past 105 days in an
"isolation experiment" to try to replicate the conditions a
spaceship crew would face on a manned trip to Mars.  The six
included four Russians, a German and a Frenchman who entered the
facility March 31 in order to see how their bodies and minds
would cope with the isolation and limited communication from
Earth. Two of the six are astronauts, the others are an
oncologist, a sports physiologist, an airline pilot and an army
engineer.  By all accounts, the experiment went well, although
concrete results from the 72 tests conducted during the 105 days
won't be released for several weeks. The men appeared to be in
good health as they stood together in a row in front of a large
assembly of journalists and staff after exiting to loud
applause.  'Giant Leap for International