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Wilhelm Conrad Roentgen


        Wilhelm Conrad Roentgen was a Nobel-winning German scienist who credited with he discovery of X-rays.
        In 1895 while experimenting with electric current flow in a cathode-ray tube, Wilhelm Conrad Roentgen observed that a nearby piece of barium platinocyanide gave off light when the tube was in operation. In view of its uncertain nature, he called the phenomenon X-radiation(also roentgen radiation). He took the first X-ray photographs:interiors of metal objects and of the bones on his wife's hand.

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Thomas Alva Edison

        Thomas Alva Edison was an American inventor who is considered one of America's leading businessmen. Edison rose from humble beginnings to work as an inventor of major technology including the first commercially viable incandescent light bulb.         Thomas Edison's inventions included the telegraph, the universal stock ticker, the phonograph, the first commercially practical incandescent electric light bulb, alkaline storage batteries and the Kinetograph.
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Carles Robert Darwin

        Charles Robert Darwin  was a naturalist and biologist known for his theory of evolution and the process of natural selection.         Darwin's theory of evolution declared that species survived through a process called "natural selection" where those that successfully adapted or evolved to meet the changing requirements of their natural habitat thrived while those that failed to evolve and reproduce died off. Through his observations and studies of birds, plants and fossils. Darwin noticed similarities among species all over the globe along with variations based on specific locations leading him to believe that the species we know today had gradually evolved from common ancestors. Darwin's theory of evolution and the process of natural selection later became known simply as "Darwinism".
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First Women Professor

        Marie Cruie was a French chemist. She was the first women who professor. She won the Nobel Priz e. She was the first women who won the Nobel Prize. She had 2 Nobel Prize also that was the first time for history.         She worked on radioactivity. Radioactivity unit of cruie. She discovered polonium and radium.She passed away. After her death people said "She died for science."
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