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René Descartes
René Descartes (1596-1650) was a French mathematician, natural scientist, and philosopher, best known by the phrase 'Cogito ergo sum' ('I think therefore I am'). He published works on optics, coordinate geometry, physiology, and cosmology...

Definition
Isabella d'Este
Isabella d’Este (l. 1474-1539), was the leading lady of Renaissance Italy who funded the works of such renowned artists as Leonardo da Vinci and Michelangelo. Many of the greatest Renaissance artworks would not exist today if not for the...

Definition
Mars
Mars was the Roman god of war and second only to Jupiter in the Roman pantheon. Although most of the myths involving Mars were borrowed from the Greek god of war Ares, Mars did have some uniquely Roman features. Mars is considered more level-headed...

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Jeremy Bentham
Jeremy Bentham (1748-1832) was an English philosopher and liberal social reformer best known as the founder of utilitarianism based on the greatest happiness principle, that is, rationally judging the success of a law by considering how many...

Definition
Herculaneum
Herculaneum, located on the Bay of Naples, was a Roman town which was destroyed by the eruption of Mount Vesuvius in 79 CE. Like its neighbour Pompeii, the town was perfectly preserved by a metres-thick layer of volcanic ash which, in the...

Definition
Hawker Hurricane
The Hawker Hurricane was a single-seat fighter plane, Britain's first monoplane, which fought in the Battle of Britain in the summer of 1940. Slower but more numerous than the Supermarine Spitfire, the Hurricane was used by the Royal Air...

Definition
Mesrop Mashtots
Mesrop Mashtots (360/370 - c. 440 CE) invented the Armenian alphabet in 405 CE. Besides greatly increasing levels of literacy in the country, the language permitted ordinary people to read the Bible for the first time, thus helping to further...

Definition
Kachina Cult
The Kachina (also “Katsina”) cult refers to the specific religious practices centered on the kachina, which is a spiritual entity and divine messenger of the Puebloan peoples as well as the Hopi, Zuni, Tewa, and Keresan tribes in what is...

Definition
Thames Tunnel
The Thames Tunnel was completed in 1843 and connects the two banks of the River Thames at Rotherhithe and Wapping in London. The 20-year project was masterminded by Marc Isambard Brunel (1769-1849) and was both the first tunnel to be built...

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Battle of Hoff, 1807
The Battle of Hoff (6 February 1807) was fought between the Russian rearguard and the French Cavalry Reserve, a day before the bloody Battle of Eylau (7-8 February). Painting by Jean-Charles Langlois, before 1849.
Palace of Versailles.