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    Amedeo Avogadro, Italian Chemist  
In 1811 Amedeo Avogadro hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. From this hypothesis it followed that relative molecular weights of any two gases are the same as the...
 
    Meriwether Lewis, Lewis and Clark Expedition  
Meriwether Lewis was an American explorer, soldier, and public administrator, best known for his role as the leader of the Lewis and Clark Expedition also known as the Corps of Discovery, with William Clark, whose mission was to explore the...
 
    Sir Walter Scott, Scottish Writer & Poet  
Sir Walter Scott was a Scottish historical novelist, playwright, and poet. Scott was the first English-language author to have a truly international career in his lifetime, with many contemporary readers in Europe, Australia, and North A...
 
    William Clark, Lewis and Clark Expedition  
William Clark was an American explorer, soldier, Indian agent, and territorial governor. A native of Virginia, he would also grow up in pre-statehood Kentucky before later settling in what later became the state of Missouri. Along with Meri...
 
    Napoleon Bonaparte, Emperor of the French  
Napoleon Bonaparte was a French military and political leader who rose to prominence during the latter stages of the French Revolution and its associated wars in Europe. As Napoleon I, he was Emperor of the French from 1804 to 1814 and a...
 
    William IV of Great Britain and Ireland  
William IV was King of the United Kingdom of Great Britain and Ireland and of Hanover from 26 June 1830 until his death. William, the third son of George III and younger brother and successor to George IV, was the last king and penultimate...
 
    George IV of Great Britain and Ireland  
George IV was the king of Hanover and the United Kingdom of Great Britain and Ireland from the death of his father, George III, on 29 January 1820 until his own death ten years later. From 1811 until his accession, he served as Prince Regen...
 
    Thomas Telford, Scottish Civil Engineer  
Thomas Telford was a Scottish civil engineer, architect and stonemason, and a noted road, bridge and canal builder. Apprenticeship as a stonemason laid the basis for Telford's move via Edinburgh to London, where he worked on Somerset House...
 
    Nicolas-Jacques Conté, Inventor of the Pencil  
Nicolas-Jacques Conté was a French painter, balloonist, army officer, and inventor of the modern pencil. He distinguished himself for his mechanical genius which was of great avail to the French army in Egypt. Napoleon called him “a univ...
 
    Antonio Salieri, Italian Composer  
Antonio Salieri is still better known today for the renowned composers with whom he was associated than for his own many and varied compositions. While he cannot be ranked among the great masters himself, he has nevertheless come into view...
 
    Lamarck, Theory of Evolution  
Jean-Baptiste de la Marck, often just known as "Lamarck", was a French soldier, naturalist, academic and an early proponent of the idea that evolution occurred and proceeded in accordance with natural laws. In the modern era, Lamarck is re...
 
    Jeremiah Dixon, Mason–Dixon Line  
Jeremiah Dixon was an English surveyor and astronomer who is best known for his work with Charles Mason, from 1763 to 1767, in determining what was later called the Mason–Dixon line. Dixon was born in Cockfield, near Bishop Auckland, Cou...
 
    Charles VII, Holy Roman Emperor  
Charles VII was the prince-elector of Bavaria from 1726 and Holy Roman Emperor from 24 January 1742 until his death in 1745. A member of the House of Wittelsbach, Charles was the first person not born of the House of Habsburg to become empe...
 
    Francis Hutcheson, Irish Philosopher  
Francis Hutcheson was a philosopher born in Ireland to a family of Scottish Presbyterians who became one of the founding fathers of the Scottish Enlightenment. Hutcheson was an important influence on the works of several significant Enlight...
 
    Frederick William I of Prussia, The Soldier-king  
Frederick William I was the King in Prussia and Elector of Brandenburg (as Frederick William II) from 1713 until his death. He was in personal union the sovereign prince of the Principality of Neuchâtel. The King acquired a reputation fo...
 
       
 
         
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