Lene Hau. Lene Vestergaard Hau (born November 13, 1959 in Vejle, Denmark) is a Danish physicist. In 1999, she led a Harvard University team who, by use of a Bose-Einstein condensate, succeeded in slowing a beam of light to about 17 metres per second, and, in 2001, was able to stop a beam completely.
Zeta is the sixth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 7. It was derived from the Phoenician letter zayin. Letters that arose from zeta include the Roman Z and Cyrillic Ð.
By the 13th century, Zeta had replaced Duklja when referring to the realm. In the late 14th century, southern Montenegro (Zeta) came under the rule of the BalÅ¡iÄ noble family, then the CrnojeviÄ noble family, and by the 15th century, Zeta was more often referred to as Crna Gora (Venetian: monte negro). Large portions fell under the control of the Ottoman Empire from 1496 to 1878.