Beauty Very Short Introduction

Quantum mechanics (QM; also known as quantum physics, or quantum theory) is a fundamental branch of physics which deals with physical phenomena at nanoscopic scales, where the action is on the order of the Planck constant. The name derives from the observation that some physical quantities can change only in discrete amounts (Latin quanta), and not in a continuous (cf. analog) way. It departs from classical mechanics primarily at the quantum realm of atomic and subatomic length scales. Quantum mechanics provides a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. Quantum mechanics provides a substantially useful framework for many features of the modern periodic table of elements, including the behavior of atoms during chemical bonding, and has played a significant role in the development of many modern technologies.

Despite the turmoil of Arab nationalism and fundamentalism, Middle Eastern wars, and oil crises, the history of the Arab world has been little known and poorly understood in the West. One reason may be that, for more than half a century, there has been no up-to-date single volume work that chronicles the story of Arab civilization - until now.

A box grouping the ballets of Piotr Tchaikovsky may not be particularly original, but this Decca reissue of Swan Lake, The Sleeping Beauty and The Nutcracker performed by the Mariinsky Theatre Orchestra under Valery Gergiev nonetheless requires extra attention. The new liner notes by Julian Haylock coming with the set fail to remind us that these ballets were either created for St. Peterburg's Mariinsky or made famous by that theatre and to this day never left its repertory.

Therion is a Swedish symphonic metal band founded by Christofer Johnsson in 1987. The word 'therion' comes from the Greek therion (θηρίον), meaning 'Beast,' i.e., that of the Christian Book of Revelation. However, the band's name is a homage to the Celtic Frost album To Mega Therion. Beginning as a death metal band, they later turned to combining orchestral elements with their metal music, employing heavy use of choirs and classical musicians, not only as additions to but also as integral parts of the composition. Therion is the first metal band with fully live orchestra featured. It is also the band which originated, popularised and influenced the symphonic metal genre, cited as 'the most adventurous metal band at present'. Because of these extents they take in conducting their music, they have been dubbed as 'Opera Metal'.

Essential: a masterpiece of progressive rock music.
Focus has always been a band with sense of humor, not only for the strange sounds and yodeling emitted by Thijs Van Leer but also for the jokes they made of sacred cows.