Spreadhseeting ems
With some help, and a lot of simplifying assumptions, I've put together the spreadsheet at https://docs.google.com/spreadsheets/d/1CZ565cTZh0upkiE3aeHqOVxybI38Fwn6zSpPT2YVGGY/edit#gid=0 , mainly to help me work out some background structure for some scifi stories.
Can you think of any ways to improve the sheet?
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