Foreign accent syndrome.

One of the most mysterious medical conditions out there is 'Foreign accent syndrome' (FAS). It's a rare disorder that causes people to suddenly speak with an accent that is completely different from their native one. There have been reported cases of people speaking with Chinese, French, and even Swedish accents, even though they had never been to those countries or spoke those languages.

While the cause of this rare disorder is still unknown, researchers are working hard to learn more about it.

There have been some success stories of people with foreign accent syndrome being able to...