Science Timeline

  • 440

    440 BC

    Democritus starts his theory about atoms.
  • Jan 7, 1543

    Sun is the center

    Copernicus discovered that the sun is in the center rather than the earth being the one in the center.
  • The Law of Falling Bodies

    Galileo Galilei said that heavier the body the faster it falls than lighter ones. By proving that all bodies fall at the same rate.
  • Blood Circulation

    William Harvey discovered that blood circulates through the body and names the heart as the organ responsible for pumping the blood.
  • Universal Gravitation

    Issac Newton came up with the conclusion that all the obejcts in the universe extert gavitational attraction on each other.
  • Hydrodynamica

    Daniel Bernoulli published Hydrodynamica in which explained the relationship between pressure and velocity of fluids. The Bernoulli effect.
  • Andres

    Andres Celsius invents the celsius temperature scale.
  • Mikhail

    Lomonosov formulates the laws of conservation of mass and energy.
  • Photosynthesis

    Jan Ingenhousz: Plants react differently in sunlight differently than in the shade. Plant leaves take in carbon dioxide and roots absorb water the sunlight runs a reaction that yields glucose and oxygen.
  • Period: to

    The Milky Way Is A Gigantic Disk Of Stars

    William Herschel & his sister Carolyn mapped out the entire sky and proved that out solar system resides in a giant disk of stars called the milky way.
  • Atomic Theory

    John Dalton introduces the atomic theory. In which stated that the elements consisted of tiny particals called atoms.
  • Period: to

    Electricity Transforms Chemiclas

    Humphry Davy finds that electricity can transform chemicals. He used an early battery to separate salts (electrolysis)
  • Woehler

    Friedrich Woehler acceidently synthesizes urea from inorganic materials. It proved that substances made by living things can be reproduced with nonliving substances.
  • The Periodic Table

    Dmitri Medeleev showes his first periodic table. Was compiled on the basis of arranging the elements in order, atomic wight and grouping them by similarity of properties.
  • Pasteur & Jules Francois Joubert

    Found that some bacteria from the air seemed to inhabit the growth of anthrax bacteria.
  • Chemical Dye

    The German physician & chemist Paul Ehrlich found that a chemical dye called methylene blue was absorbed by particular bacteria but not others. The concept "magic bullet" drug that would selectively destroy particular invading organisms.
  • Moissin H.

    Moissin H. developed electric furnace for making carbides and prepering pure metals, isolated fluorine.
  • Troposhere & Stratosphere

    Leon Teisserenc de Bort discovers that the atmosphere consists of layers. After 200 ballon experiments he concluded that the atmosphere is divided into two layers.
  • Santiago Ramon & Cajal

    Spanish neuroanatomist showed that the electrical signal coursing through a nerve begins in the dendrites and moves to the axon.
  • Period: to


    Marie and Pierre Curie had discovered isolate radioactivity materials. This also lead to the discovery of the elements polonium and radium.
  • The Electrons

    J.J Thomson discovered the electron. He looked further into electricity and magnetism and he ended up finding a particle that contained in atoms.
  • P. Flourescens

    Rudolf von Emmerich and O. Loew discovered P. Flourescens. It can also help treat things such as skin wounds, killing or suppressing the microorganisms causing surface infections.
  • Seconds Not A Second

    Albert Einstein said that a second is not a second. The second is by one clock belongs to less than a second measured by another clock.
  • Magnetic Field Reversal

    Bernard Bushes discovered that the Earth's magnetic field had changed direction & reversed itself.
  • Radiometric Dating

    Bertram Boltwood discovered how to calculate the age of a rock by measuring the rate of its radioactive decay.
  • Scilvarsan 606

    Ehrlich, develoved a drug called Scilvarsan 606, which was effective against syphilis.
  • The Nucleus

    Ernest Rutherford, using a thin piece of gold foil, established that the nucleus was positively charged also that the electrons were located outside the nucleus.
  • Continental Drift

    Alfred Wegener said that at first all the continents once were all together forming a gaint landmass. Then with time they started to drift apart.
  • Bohr

    Bohr began postulating atomic models. Certain parameters of the electrons orbit were "quantized."
  • Covalent Bonds

    Gilbert Netwon Lewis, discovered that covalent bonds are brought by the sharing of pairs of electrons between two atoms. Each atom in a covalent bond will share one electron.
  • Isotopes

    Aston discovered isotopes and he also builds the mass spectrograph.
  • Atomic Structure

    Niels Bohr developed an explanation of atomic structures.
  • de Broglie

    de Broglie discovered that electrons had a dual nature-similar to both particles & waves.
  • Heisenberg

    Heisenberg describes atoms by means of formula. Connected to the frequences of spectral lines.
  • Pauling's seminal paper

    Pauling's seminal paper was the realization that the orbits of electrons in isolated singnal atoms were not of the right shape for bonding with other atoms.
  • Virulent Bacteria

    With a experiment with mice the bilogist Fred Griffith found that virulent bacteria even when it has been killed with heat could transform nonvirulent bacteria into virulent bacteria. He ended up concluding that the genetic material was being passed from the first to the second.
  • Schrodinger

    Schrodinger viewed electrons as continous clouds and introduced the "wave mechanics" (mathematical model of the atom.)
  • Periodic Ice Ages

    The astrophysicist Miultin Milankoviten developed a theory that related to earth's motion to long-term climate change & Ice Ages.
  • Pauling Oxygen

    Found how oxygen bonds to hemoglobin.
  • Pauling Protein Molecules

    Discovered how protein molecules fold up and unfold, key factor in their behavior & proerties.
  • The Krebs Cycle

    Hans Krebs. He identifies that there are many steps that the cell takes to convert sugars, fat and protenis into energy. It's a series of chemical reaction using oxygen. This cycle contributes to the breakdown of carbonhydrates, fats and proteins into carbon dioxide and water.
  • Some Genes Can Jump

    Barbara McClintock discovered transposons (genes that can jump on a chromosome) Transposons are segments of DNA that can move to a different position in the genome of a single cell. This might also cause mutations & increas/decrease.
  • Controlled Chain Reaction

    Enrico Fermi conducted the first controlled chain reaction. In which it released energay from the atoms nucleus.
  • First Identification

    Pauling, first identification of molecular disease, sickle-cell anemia.
  • DNA Structure

    The DNA structure was first discovered by James Watson, Francis Crick, and Rosalind Frankline. They said that it's shaped like a twisted ladder. Each of two legs of it forms a helix. And each rug consists of two small molecules fastened together. C-G, G-C, A-T, T-A
  • RNA Conveys Genetic Information

    Scientist discovered ribonoclelc acid or RNA. RNA plays an important role in protein synthesis and other chemical activites in the cell.
  • Protons and Neutrons

    Friedman and his colleagues found that protons and neutrons are made out of three quarks a piece.
  • Oncongenes

    Harold Varmus & Michael Bishop discovered oncongenes (normal genes that control growth in every living cell, also can contribute to converting normal cells into cancer cells if mutated.)
  • RNA Splicing

    A group of scientists dicscovered RNA Splicing. The DNA is first transcribed into pre-messenger RNA, then RNA molecules are spliced to create mature messanger. Improperly spliced messanger RNA molecules create altered proteins and result in disease.
  • Achaea

    Carl Woese discovered that bacteria are not only simple. Many organisms classified in the new kingdom of Achaea are extremophiles some live in very high temp. others in low temp. Archaea are harmless to other organisms. And none are known to cause disease.
  • Friedman

    Friedman, Henry Kendall & Richard Taylor shard the Nobel Prize for discovering quarks along with leptons are the smallest know building blocks of matter.