The ethnic composition in the 18th century was clear among the Slavs; 1  In a letter to Justinian Bert in 1756, Montenegrin chieftains said: We are of the Orthodox Christian faith and law of the Eastern Church, of the honorable and glorious Slav-Serb kin.
North Texas Tollway Authority. The North Texas Tollway Authority (NTTA) is an organization that maintains and operates toll roads, bridges and tunnels in the North Texas area.
Negative thermal expansion. Negative thermal expansion (NTE) is a physicochemical process in which some materials contract upon heating rather than expand as most materials do. Materials which undergo this unusual process have a range of potential engineering, photonic, electronic, and structural applications.