Hannah Jenkins speaks English in the morning and German in the afternoon. It's not a routine she chose to adopt - but something her brain requires her to do. It all started with a cycling accident.
Her partner Andrew Wilde was halfway up a mountain in the US state of Montana when he received a baffling text from Hannah.
He understood only two words - "dog" and "hospital" - but knew instinctively something was wrong.
The text was in German, a language Hannah had grown up with, but Andrew didn't really understand. They only ever communicated in English.
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