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Arthur's brain in order to discover the Ultimate Question. This because Arthur was the only piece of Earth left besides Trillian Astra, who left the Earth with Zaphod long before Arthur and before its destruction, leaving Arthur with the most complete copy of the Earth program in his brain.
Notes and referencesEdit
Seen in - The Hitchhiker's Guide to the Galaxy in which they are characters that play a vital role in the plot, as mice are revealed to be behind the creation of Earth and the exploration of the answer to life, the universe and everything.