Here are the answers for each statement:
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An author writes about a real-life scientist and how he discovered penicillin by accident in the 1920s. Yes
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An author writes about two fictional brothers who go to California during the Gold Rush in the 1800s. Yes
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An author writes about a scientist who invents a time travel device and goes to prehistoric times. No
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An author writes about two sisters who work together to create a brand-new social media platform. No