If I could give one tip for people - it's not an exercise or nutrition regimen. It's to walk your talk and believe in yourself because at the end of the day the dumbbell and diet don't get you in shape. It's your accountability to your word.

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Clearly some creative thinking is badly needed if humans are to have a future beyond Earth. Returning to the Moon may be worthy and attainable but it fails to capture the public's imagination. What does get people excited is the prospect of a mission to Mars.