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The Achilles tendon is a tough band of fibrous tissue that connects the calf muscles at the back of the lower leg to the heel bone. It is the largest and strongest tendon in the body, used for activities such as walking, running, and jumping. It is named after the Greek mythological hero Achilles, as it is a vulnerable spot, prone to injury or rupture.

A pericardial vein is any vein that drains blood from the area around the heart, specifically the pericardium, and typically empties into the azygos or brachiocephalic veins. It helps in the circulation of blood around the heart tissues. The pericardium is the double-walled sac containing the heart and the roots of the great vessels.

Arthur Schlesinger, Jr. (1917-2007) was an American historian and social critic who served as a special assistant to President John F. Kennedy. He won two Pulitzer Prizes, one for his book The Age of Jackson and the other for his biography on President Kennedy. Schlesinger was known for his interpretation of American history, particularly his analyses of the presidency and American liberalism. He is also recognized for his works on the concept of a cycle in American political history, publishing The Cycles of American History in 1986.

the name given to the sacred writings of the Guebres or Parsees, ascribed to Zoroaster, of which he was more the compiler than the author, and of which many are now lost; they represent several stages of religious development, and as a whole yield no consistent system.

Middle watch is a term used in maritime tradition, referring to the work shift or watch duty of a sailor that occurs from midnight to 4 a.m. The day at sea is typically divided into six watches, each four hours long, and the middle watch is considered the most challenging due to the late hours.

Thyroprotein refers to any protein that is produced by or involved in the function of the thyroid gland, often associated with the production or regulation of thyroid hormones. It plays a significant role in body metabolism, growth, development, and body temperature regulation. A malfunction or disruption in thyroprotein may trigger thyroid problems that may result in hypothyroidism or hyperthyroidism.

An authoritarian state is a system of government where power is held by a single authority or leader who exercises centralized and unchallenged power. This system restricts individual freedoms, controls most aspects of public and private life, and often suppresses political dissent. While maintaining stability and order, authoritarian states often disregard aspects of democracy, human rights, and rule of law. Decisions are made by the authority figure without consultation with other entities or the public.

A magnoliopsid family is a taxonomic classification of flowering plants, also known as angiosperms, belonging to the class Magnoliopsida. This class is distinguished by its two seed leaves or cotyledons, floral parts usually in multiples of four or five, and net-like leaf venation. The different families within the class are categorized based on shared characteristics such as flower structure, fruit type, and leaf arrangement.

Radioactive material refers to any substance or material that spontaneously emits ionizing radiation, such as alpha, beta, or gamma rays, due to the instability of its atomic nucleus. This decay process can potentially cause harm to living organisms. The material can be a natural element from the periodic table, a product of a man-made nuclear reaction, or even a combination of both.