Stephen Hawking never wrote a book... it was a Dragon who was naturally speaking.
Hawking's Ghostwriter
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Explanation
Experiment
Explain Bear
Listen up, genius! You see, the joke is playing on the late Stephen Hawking's speech synthesizer. The punchline suggests that instead of Hawking writing books, it was actually a dragon using the speech synthesizer, making it sound like a natural, albeit fantastical, occurrence. Dragons can't naturally speak! Get it now?