"La Belle Dame sans Merci" ("The Beautiful Lady Without Mercy") is a ballad produced by the English poet John Keats in 1819. The title was derived from the title of a 15th-century poem by Alain Chartier called La Belle Dame sans Mercy.Considered an English classic, the poem is an example of Keats' poetic preoccupation with love and death. The poem is about a fairy who condemns a knight to an unpleasant fate after she seduces him with her eyes and singing. The fairy inspired several artists to paint images that became early examples of 19th-century femme fatale iconography. The poem continues to be referenced in many works of literature, music, art, and film. Poem The poem is simple in structure with twelve stanzas of four lines each in an ABCB rhyme scheme. Below are both the original and revised version of the poem: Inspiration In 2019 literary scholars Richard Marggraf Turley and Jennifer Squire proposed that the ballad may have been inspired by the tomb effigy of Richard FitzAlan, 10th Earl of Arundel (d. 1376) in Chichester Cathedral...

Apicius, also known as De re culinaria or De re coquinaria (On the Subject of Cooking) is a collection of Roman cookery recipes. It is thought to have been compiled in the fifth century AD. Its language is in many ways closer to Vulgar than to Classical Latin, with later recipes using Vulgar Latin (such as ficatum, bullire) added to earlier recipes using Classical Latin (such as iecur, fervere). The book has been attributed to an otherwise unknown Caelius Apicius, an invention based on the fact that one of the two manuscripts is headed with the words "API CAE" or rather because a few recipes are attributed to Apicius in the text: Patinam Apicianam sic facies (IV, 14) Ofellas Apicianas (VII, 2). It has also been attributed to Marcus Gavius Apicius, a Roman gourmet who lived sometime in the 1st century AD during the reign of Tiberius. The book also may have been authored by a number of different Roman cooks from the first century AD. Based on textual analysis, the food scholar Bruno Laurioux believes that the surviving version only dates from the fifth century (that is, the end of the Roman Empire...

Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes. Examples of iridescence include soap bubbles, feathers, butterfly wings and seashell nacre, and minerals such as opal. It is a kind of structural coloration that is due to wave interference of light in microstructures or thin films. Pearlescence is a related effect where some or most of the reflected light is white. The term pearlescent is used to describe certain paint finishes, usually in the automotive industry, which actually produce iridescent effects. Etymology The word iridescence is derived in part from the Greek word ἶρις îris (gen. ἴριδος íridos), meaning rainbow, and is combined with the Latin suffix -escent, meaning "having a tendency toward". Iris in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of...

Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. Corundum has two primary gem varieties: ruby and sapphire. Rubies are red due to the presence of chromium, and sapphires exhibit a range of colors depending on what transition metal is present. A rare type of sapphire, padparadscha sapphire, is pink-orange. The name "corundum" is derived from the Tamil-Dravidian word kurundam (ruby-sapphire) (appearing in Sanskrit as kuruvinda).Because of corundum's hardness (pure corundum is defined to have 9.0 on the Mohs scale), it can scratch almost all other minerals. It is commonly used as an abrasive on sandpaper and on large tools used in machining metals, plastics, and wood. Emery, a variety of corundum with no value as a gemstone...