Olivine has the formulae (Mg,Fe)2SiO4 and a relative hardness of 7. It's name is derived from the characteristic olive green colour. A common rock forming mineral. A clear green variety is called peridot and has some uses as a gem.
Hear it on YouTube. Here's a piece that many people know, and rightfully so! This famous classical piece from the romantic period is one of those pieces that has the ability to make anyone feel happy. Composed in the 1920s, for a ballet, the piece was an instant success.
Victorian ballroom dances at the Gaskell Ball in Oakland, California. Historical dance (or early dance) is a term covering a wide variety of Western European-based dance types from the past as they are danced in the present. Historical dances are danced as performance, for pleasure at themed balls or dance clubs, as historical reenactment, or for musicological or historical research purposes. Dances from the early 20th century can be recreated precisely, being within living memory and after the advent of film and video recording.