Two years ago, the Australian Ben McMahon had a scary car crash, and fell into a coma for more than a week. The 22-year old remembers that when he woke up, He saw a nurse, that seemed of Asian descent, Standing next to his bed. Then I told her: 'Sorry, I really feel a lot of pain ', fluent in Chinese. The new language skills left speechless doctors and his family, after it was unable to reach agreement with them because he had forgotten his mother tongue. It took him at least three days to remember English again…