Factual error: When they are in Lidenbrock's camp, they are talking about rising temperatures using Fahrenheit. Hannah is Icelandic therefore she would use Celsius instead (like most of the world does).
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Suggested correction: They are using a thermometer that is reading in Fahrenheit, so that's what she is saying out loud. Yes, you could probably change the setting to read in Celsius, but Hannah also knows that she is dealing with Americans. She knows they won't be able to understand Celsius. PS: I'm American.
