The Hitchhiker's Guide to the Galaxy
42, or The Answer to the Ultimate Question of Life, The Universe, and Everything

In the works, the number 42 is given as The Answer to the Ultimate Question of Life, The Universe, and Everything by the computer Deep Thought. The absurdly simple answer to a complex philosophical question became a frequent reference in popular culture in homage to The Hitchhiker's Guide, particularly within works of science fiction and in video games, such as in Doctor Who, Lost, Star Trek and The X-Files.

2020 was the 42nd anniversary of HG2G appearing on Radio 4. The book Hitchhiking: Cultural Inroads was dedicated to the memory of British actor Stephen V. Moore who died in Oct 2019 and played the voice of Marvin the Paranoid Android in the original BBC Radio and Television Series.
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