Five years after landing on the surface of Mars, two planetary rovers whose life expectancy was supposed to be 90 days are still plugging along, although they could definitely use some time in the repair shop.
With the horrible failures of the past 20 years - - two shuttles destroyed and various probes and landers disappeared without a trace, it's sometimes hard to remember a time when NASA missions went flawlessly, but many of us who grew up in the 60's remember Mercury, Gemini, Apollo and Skylab, which were all successful, with the exceptions of Apollo 1 and Apollo 13.
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