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We know that Chell was a child probably under the age of ten (she misspelled the word observations as odservations) when the BYDTWD catastrophe happened, meaning that she would have to be born some time after 1980, as BYDTWD occurred in the time before dot matrix printer paper fell out of use. We also know that Cave Johnson became sick with moon rock poisoning around this time, and that by that time, Johnson was really old. So, chances are, he wasn't the father.

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