FAQ

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This is a work of fantasy fiction. Brains cannot be transplanted. In fantasy fiction anything is possible but it is still just fiction. The reason Bella's brain accelerates to maturity in a matter of a months is to enable the story's characters to remain the same age throughout the movie and for the story of Bella's awakening and freedom to be told in an honest way without taking up too much time at the start of the film.

It is reported Bella was "progressing at an accelerated pace" and "her hair grows one inch every two days". The human hair grows 6 inches per year, the human brain takes 25 years to develop. So if Bella's brain matures at the same rate her hair grows, she would have the equivalent of an adult's brain in under 10 months. Since babies do not see in colour until they are 4 months old, the hair clue combined with the film's symbolic switch to colour right before Bella's first sexual encounter with Duncan helps us understand that Bella was about 10 years old at the time. While it is unlikely that Duncan knew the truth about Bella, he was clearly attracted to her childish behavior and the power he could wield over her in their relationship. However, these are the actions of a deeply flawed character and the film does not condone them in any way.