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Dangerous to health! Do not repeat chemical experiments! Uranium and other radioactive elements in the periodic table are after lead - from the 83rd to the very last cell. To understand their nature - let's look into the past of our universe. What happened in the Universe immediately after the Big Bang? How did light and heavy elements appear. And also: a radioactive isotope of hydrogen, technetium foil, spontaneous combustion of uranium, liquid cesium and a real palette of radioactive compounds. #chemistry #radiation #howitworks