Nothing for the history books, but here it is:
PASADENA, Calif. - NASA's Mars Curiosity rover has used its full array of instruments to analyze Martian soil for the first time, and found a complex chemistry within the Martian soil. Water and sulfur and chlorine-containing substances, among other ingredients, showed up in samples Curiosity's arm delivered to an analytical laboratory inside the rover.
http://www.nasa.gov/mission_pages/msl/news/msl20121203.html