Whether you are an astronomer or a life scientist, geophysicist, or a pilot, you've got to be there because you believe you are good in your field, and you can contribute, not because you are going to get a lot of fame or whatever when you get back.

Alan Shepard

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Through all the hardships and all the operations and all the hospitals, all that stuff each part of my life, there's been some goodness, some greatness that comes in here and helps me to be strong, to continue what I'm doing.