Just as in school, says Frederic Huynh, senior principal scientist at FICO, "even if you fail one class as a freshman, you can still graduate with honors" if the rest of your record is good.

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He is senior research scientist at NASA's Langley Research Center and principal investigator on the Mars ARES mission.

NPR: Revisiting the Viking Missions to Mars

Joel Levine is senior research scientist at NASA's Langley Research Center and principal investigator on the Mars ARES mission proposed some time in the future.

NPR: Revisiting the Viking Missions to Mars

Spencer, a principal research scientist at the University of Alabama-Huntsville and former senior scientist for climate studies at NASA, has also observed that results of the one or two dozen climate modeling groups around the world often reflect a common bias.

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