You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: THE COMPUTER AGE
Clue: Dan Bricklin developed VISICALC, the first of these programs, similar to an accounting ledger
spreadsheet

Category: BRAND "O"
Clue: You can read "Story O's" about this cookie on its website
oreos

Category: MUSEUMS
Clue: In 2000 Jackson, Tennessee's Railroad Museum celebrates the centennial of this engineer's heroic deed
casey jones