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Tlaxcala , city, Mexico

(Encyclopedia)Tlaxcala, city (1990 pop. 50,486), capital of Tlaxcala state, E central Mexico. It is the site of the oldest Christian church in the Americas, founded (1521) by the Spanish explorer Hernán Cortés. N...

foot-and-mouth disease

(Encyclopedia)foot-and-mouth disease or hoof-and-mouth disease, highly contagious disease almost exclusive to cattle, sheep, swine, goats, and other cloven-hoofed animals. It is caused by a virus, specifically an a...

rock carvings and paintings

(Encyclopedia)rock carvings and paintings, designs inscribed on rock surfaces and huge stone monuments in many parts of the world by prehistoric or preindustrial peoples. They have been found on every continent and...

perfluoroalkyl and polyfluoroalkyl substances

(Encyclopedia)perfluoroalkyl and polyfluoroalkyl substances (PFAS), a group of several thousand synthetic organic chemical compounds made up of a chain of carbon atoms bonded to fluorine atoms. PFAS, which resist w...

monsters and imaginary beasts

(Encyclopedia)monsters and imaginary beasts. The mythologies and legends of ancient and modern cultures teem with an enormous variety of monsters and imaginary beasts. A great number of these are composites of diff...

Döllinger, Johann Joseph Ignaz von

(Encyclopedia)Döllinger, Johann Joseph Ignaz von yōˈhän yōˈzĕf ĭgˈnäts fən dölˈĭngər [key], 1799–1890, German theologian and historian, leader of the Old Catholics. Ordained in 1822, he was subsequ...

physical education and training

(Encyclopedia)physical education and training, organized instruction in motor activities that contribute to the physical growth, health, and body image of the individual. The historical roots of physical education ...

Persian art and architecture

(Encyclopedia)Persian art and architecture, works of art and structures produced in the region of Asia traditionally known as Persia and now called Iran. Bounded by fierce mountains and deserts, the high plateau of...

art conservation and restoration

(Encyclopedia)art conservation and restoration, the preservation of structurally sound works of art, the halting of processes that lead to the damage of works of art, and the repair of already damaged works of art....

track and field athletics

(Encyclopedia)track and field athletics or athletics, sports of foot racing, hurdling, jumping, vaulting, and throwing varied weights and objects. They are usually separated into two categories: track, the running ...