Unsolved problems in linguistics

Cumbric is an extinct Celtic Brythonic language or dialect that was spoken during the Early Middle Ages in the Hen Ogledd or "Old North", in what is now Northern England and the southern Scottish Lowlands. Place-name evidence suggests Cumbric may also have been spoken as far south as Pendle and the Yorkshire Dales. The prevailing view is that it became extinct in the 12th century, around the incorporation of the Kingdom of Strathclyde into the Kingdom of Scotland.

first formation of language

extinct group of languages indigenous to the island of Tasmania, Australia

process starting early in human life

ancient song in an unknown language of southern China

Ancient Tibeto-Burman language of China