More than 60,000 of the Sorbian Slavic minority continue to live in the region. Historically, their ancestors are West-Slavic-speaking tribes such as the Milceni, who settled in the region between the Elbe and the Saale. Many still speak their language (though numbers are dwindling and especially Lower Sorbian is considered endangered), and road signs are usually bilingual. However, the number of all the inhabitants of this part of eastern Saxony is declining rapidly - by 20% in the last 10 to 15 years. Sorbs make efforts to protect their traditional culture manifested in the traditional folk costumes and the style of village houses. The coal industry in the region (like the Schwarze Pumpe power station needing vast areas of land) destroyed dozens of Lusatian villages in the past and threatens some of them even now. The Sorbian language is taught at many primary and some secondary schools and at two universities (Leipzig and Prague). Project "Witaj" ("welcome!") is a project of eight preschools where Sorbian is currently the main language for a few hundred Lusatian children.