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About Sandra: I'm pretty serious about answering questions, often spending 30 minutes or...I'm pretty serious about answering questions, often spending 30 minutes or more on them. I care about young and not so young people who ask questions on this site. My background is in the sciences and computers. I have learned a lot by using this site, as I have looked up many things I didn't know about. Please be polite to me, as I do my best for you.show more