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It's to know your purpose before you read something because a purpose can:

On one of his many outings through the brobdingnagian countryside, gulliver walks on a small path through a field. during this walk on the small path, how does gulliver get dirty? a. the dwarf throws at gulliver, b. the queen of brobdingnagian steps on gulliver, c. gulliver gets caught in a rainstorm, and d. gulliver falls in cow dung.

What is the most important idea that the authors of the video transcript of dr. x and the quest for food safety and the text did food safety myths exposed want the viewers to understand?