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Eight months ago, Mexico's first lady, known for her fondness of designer clothes and European vacations, made a public promise to sell a multi-million-dollar mansion bought under controversial circumstances. She's purchasing the home, at below market rates, from a contractor with lucrative connections to her husband.

The scandal has been one of the biggest to rock the president's administration. And months later many questions remain regarding the questionable purchase — and the first lady hasn't sold her house.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

In 1953, Dr. John Clements realized something fundamental about the way the lung functions — an insight that would ultimately save the lives of millions of premature babies.

The story begins in 1950, when the U.S. Army sent Clements, a newly graduated physician, to the medical division of what was then called the Army Chemical Center in Edgewood, Md. Clements was interested in doing research in biochemistry. His commanding officer was of a different mind.

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