Today is Shannon Lucid's first day on Planet Earth in six months. Her stay aboard Russia's Mir Space Station
was of record length - the longest stay of any American in space ever. During her time in orbit around the Earth, Lucid, a biochemist,
did many things including experiments on the effect of weightlessness
on the human body. Pictured above, Lucid greets the astronaut that will replace her on Mir,
John Blaha.