• 400


    400 B.C.The Atom had been introduced by Democritus. Aristotle did not believe in the Atom Theory.Aristotle believed that all matter was made of "The Four Elements" which are Fire, Earth, Air, and Water.He did not have any proof to support his theory. The Atom Theory had no proof as well. People believed and supported Aristotle's theory because in that time Aristotle was one of the greatest minds and had many followers.
  • 460


    Democritus began with the idea that everything could be broken down into smaller peices. This is how he came upon his AtomTheory. Aristotle did not believe in this theory. Democritus stated that everything could be broken down into atoms. To Democritus the atom looked like a marble.Democritus came up with the idea tha-t all matter contains atoms. He reasoned that atoms were the smallest part of matter, and could not be broken down further.
  • The American Revolution

    The American Revolution
    The establishment of America as a nation all its own occurred from 19 April 1775 to October 1781. Hostilities were required because the British considered the Thirteen Colonies nothing more than another exclave of the global British Empire, and King George wanted the lion’s share of all the Colonies’ wealth. America’s Founding Fathers had had enough, and when 8 Minutemen were killed on Lexington Green, the fight was on.
  • Antonie Lavoisier

    Antonie Lavoisier
    1779 Antonie Lavoisier found the two elements that make up water. He named one Oxygen (Greek for becoming sharp) because of the acid in it. He named the other Hydrogen (greek for water former). His finding did not change the current atom model of his time, it just added another element.
  • Joseph Proust

    Joseph Proust
    1794 Joseph Proust , a French chemist, discovered each pure compound has its own characteristic elemental composition. For instance, the ratio of the elements will never change regardless of the masses. For example, NaCl, will have a ratio of 1 to 1 no matter how big or small its mass is.
  • John Dalton

    John Dalton
    John Dalton developed the Atomic Theory in 1800. He still believed that the atom was the smallest unit of matter, and that it could not be broken down. He believed in Democritus' theory of the atom looking like a marble. John Dalton also tried to calculate the atomic weight of compounds. He also tried to come up with the atomic structures of atoms.
  • Louisiana Purchase

    Louisiana Purchase
    Thomas Jefferson doubled the United States of America’s area. The U. S. paid 60 million francs, and canceled French debts totaling another 18 million, for a grand total of 78 million francs, or about $15 million. Today, that would be worth about $220 million, which is an extraordinarily good sale price for 828,800 square miles.
  • Amedeo Avogadro

    Amedeo Avogadro
    1811 Amedeo Avogadro, discovered what are now known as Avogadro's Law and the Avogadro Constant. Avogadro's Law states that two samples of an ideal gas which have the same temperature, pressure, and volume will also have the same number of molecules. The Avogadro Constant defines the number of constituent particles in one mole of a substance.
  • William Crookes

    William Crookes
    William Crookes biggest discovery is easily that of is discovery of thallium. Later on in his life he went on to invent the Crookes tube. He also later invented the Crookes radiometer, which is a novelty nowadays. William Crookes was a chemist and physicist who discovered the element thallium. Crookes also identified the first known helium sample. In addition, the British scientist invented the Crookes radiometer, known today as the light mill.
  • The Civil War

    The Civil War
    Many war experts consider it the first modern war, not because of the Gatling gun, but because of musket rifling and the Minie ball. As said in #10, 600,000 Americans died. This was horror on a scale no American ever saw before or since. Most of the common soldiers enlisted and fought for the money and three square meals a day. This was a job, and the promise of adventure, for the price of possible death or injury. By the time it was over, Richmond had been bombed into a moonscape, General Sherm
  • Assassination of Abraham Lincoln

    Assassination of Abraham Lincoln
    Regardless of this sentiment, Booth was from Maryland, considered himself a southerner, and considered Lincoln the root cause for the destruction of the South, the deaths of its brave men, and the dishonor done to its institution of slavery. He decided that Lincoln had to die for his crimes, and conspired with David Herold, John Surratt, George Atzerodt, and Lewis Powell not just to kill Lincoln, but for Powell to break into Secretary of State William Seward’s house and stab him to death.
  • Henri Becquerel

    Henri Becquerel
    1895 Henri Becquerel discovered uranium produced x-ray radiation. Which led him to discover radioactivity. All this happened as he was investigating phosphorescence. Henri's discovery showed that the atom was not indivisible or able to change shape.
  • Madame Curie

    Madame Curie
    Madame Curie was the physicist with expertise in chemistry that, in 1898, discovered the radioactive substances of radium and polonium in Paris, France. She was the first to isolate pure radium, and was world renowned as the leading expert on radiation. In fact, she coined the term, "radioactivity." The Curies and Henri Becquerel shared the Nobel Prize for Physics because of their discovery of natural radioactivity. Years later, after a brutal political fight, Marie was awarded the Nobel Prize f
  • Max Planck

    Max Planck
    Max Planck found the Quantum Theory. The Quantum theory states "In 1900 Max Planck made a profound discovery in modern physics . He showed that light must be emitted and absorbed in discrete amounts if it was to correctly describe observed phenomena Prior to then light had been considered as a continuous electromagnetic wave, thus the discrete nature of light was completely unexpected."
  • JJ Thompson

    JJ Thompson
    JJ Thompson discovered the electron using the cathode-ray tube. in 1904 Thompson thought the atoms was a sphere of positive force with electrons around it. This is known as the plum pudding model. Thompson also created a mass spectrograph which found isotopes.
  • Albert Einstein

    Albert Einstein
    1905 Einstein discovered the theory of relativity and the mass energy equivalence, e = mc2. E = mc2 means energy = mass multiplied by the speed of light squared. This formula led to atomic bombs and nuclear power. With this formula you could power New York City for months from a gallon of water.
  • Robert Millikan

    Robert Millikan
    1908 Robert Millikan was responsible for finding the charge of a single electron. He did this using his oil drop experiment. He proved that subatomic particles do exist. Millikan is also credited with proving einstein. he did this by using the Photoelectric effect.
  • Henry Moseley

     Henry Moseley
    1913 Henry Mosely found the relatinship between wavelengths, x-rays produced, and the atomic number of a metal. His finding became knowen as Mosely's Law.
  • Niels Bhor

    Niels Bhor
    1913 Niels Bhor proposed a new atom model that would allow the electrons to be outside the nucleus and in orbit around the nucleus. Bhor said the electrons were on a special orbit. His model is known as the Bhor Model.
  • Ernest Rutherford

    Ernest Rutherford
    Ernest Rutherford discovered the nucleus. His theory was the atom has a positive nucleus with negative electrons orbiting around it. This changed the atom greatly because it was now known that most of the atoms weight is in the nucleus. His model was known as planetary system model. Ernest rutherford was the student of JJ Thompson.
  • Erwin Schrodinger

    Erwin Schrodinger
    1926 Ewrin Schrodinger came up with the equation for quantum wave mechanics. His equation was the the second theory or explanation for the reason electrons move when in an atom. He tried to see electrons in packets that moved in waves.
  • Louis De Broglie

    Louis De Broglie
    Louis De Brogile is known for a lot of things but he is most known for discovering the process of electron diffraction by crystals. In 1927 at Bell Labs, Clinton Davisson and Lester Germer fired slow-moving electrons at a crystalline nickel target. The angular dependence of the reflected electron intensity was measured, and was determined to have the same diffraction pattern as those predicted by Bragg for X-Rays.
  • Werner Heisenberg

    Werner Heisenberg
    1927 Werner Heisenberg came up with the uncertainty priciple. the uncertainty principle says that you cant measure the current position of a particle and also measure the position it will be in after it moves.
  • James Chadwick

    James Chadwick
    1932 James Chadwick proved the exsistence of neutrons. This affected the atom model greatly because another subatomic particle was found in the atom. James Chadwick changed the way the atom was viewed.
  • Manhattan Project

    Manhattan Project
    The whole project was given a big headstart by Dr. Albert Einstein, who signed a letter written by Leo Szilard, which was sent to F. D. Roosevelt, advising him that the Nazis were probably trying their best to invent a nuclear weapon, which they would certainly use on the civilian population of some large city, probably London or Moscow
  • Vietnam War

    Vietnam War
    In many ways, the Vietnam War was a product of decades of lousy politics, not just American, but including the global spread of Communism. Communism works on paper, but when you add human desires to it, it fails. But America entered the Vietnam conflict largely because it felt threatened by Communism’s spread into democratic South Vietnam, and has sworn to defend democracy.
  • Assassination of John F. Kennedy

    Assassination of John F. Kennedy
    The jury is still out, and probably will be for a very long time, as to why in the world Kennedy had to die. There are loads of conspiracy theories, most centering on the Chicago mafia. Sam Giancana is thought to have rigged the election to get Kennedy into the Office, but why he did this is a long, complicated story. In general, Giancana believed his interests would fare better under Kennedy. The answer is almost always money.
  • Apollo 11

    Apollo 11
    For once, we will end on a major chord. In just about a week we remember the significant events of July 20, 1969, when humanity did itself proud, in spite of all its wars, sadism, hatred, and insanity. We set foot on another world. We have no choice but to remember the awful things our species has perpetrated on itself and on Planet Earth. But we can now choose to think of ourselves as ultimately good. Beneath it all, we are a decent species. We did not, until this date, possess or even deserve
  • September 11, 2001

    September 11, 2001
    The current global generation’s “JFK moment” took place on a Tuesday morning, when Islamic extremists indoctrinated (brainwashed) by Osama bin Laden hijacked 4 commercial passenger jets and deliberately flew them into major American landmarks. Their sole intent was indiscriminate mass murder, for the purpose of causing as much physical, emotional, mental, psychological and financial harm on America as they possibly could. Their motives were, and still are, convoluted, complicated, and completely
  • Death of Osama Bin Laden

    Death of Osama Bin Laden
    Adolf Hitler and Josef Stalin had, until bin Laden’s death, been without parallel in the world’s opinion of villainy. They were absolute evils, universally despised except by very small numbers of fanatics whose philosophy no one has ever taken seriously. Bin Laden’s status the world over was virtually equivalent to this. He still has plenty of supporters, most of them in various places throughout the Middle East, but their percentage is microscopic compared to the favorable response to his deat