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May 28, 1543
discovery earth moves
Copernicus placed the sun , not the Earth , at the center of one system -
discovery of anesthesia
Several scientists discovered that certain chemicals can be used as an anesthetic , making it possible to perform surgery without pain. The first experiments with anesthetic agents - nitrous oxide (laughing gas ) and sulfuric ether - are performed mainly by dentists 19th century . -
discovery of x rays
Wilhelm Roentgen accidentally discovered X-rays in radiation experiments with cathode rays ( electrons). He realizes that the rays can penetrate opaque black paper wrapped around a cathode ray tube , causing a form that shines with fluorescence. Their discovery revolutionized physics and medicine, which earned him the first Nobel Prize in Physics in 1901 . -
discovery of plate tectonics
The work of many scientists show that the surface of the Earth is divided into several interconnected plates. The outermost layer of the Earth , the lithosphere, is divided into at least seven large pieces , rigid. These plates move in different directions and at different speeds (about 1-4 inches per year ) and are falling together, away from each other . All the action in plate boundaries produces phenomena such as mountains , volcanoes and earthquakes.
