Cryptophasia is the official term for the languages twins use that only they can understand. A polyglot is a person who masters languages.
At the time of the French Revolution, 75% of French citizens did not speak French as a mother tongue. Until the 19th century, French was spoken more widely in Holland and Germany than in some parts of France.
Black and white family photo with four standing and two sitting
Busy airport check-in
An extravagant and ornate golden house
Posed photo of doctor and four workers with hard hats and tools