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BEVERLY HILLS, CA - JULY 22:  (L-R) Paula Apsell, Dr. Michael Watkins, Dr. Ashwin Vasavada, Rob Manning, and Gail Willumsen speak onstage at the 'NOVA - Ultimate Mars Challenge' panel during day 2 of the PBS 2012 Summer TCA Tour held at the Beverly Hilton Hotel on July 22, 2012 n Beverly Hills, California.  (Photo by Paul A. Hebert/ *** Local Caption *** Paula Apsell; Dr. Michael Watkins; Dr. Ashwin Vasavada; Rob Manning; Gail Willumsen / Licensing available ONLY through