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Radioactive Decay. Yesterday we learned that all elements have different isotopes. Example: 1 H (1 proton, 0 neutrons) 2 H (1 proton, 1 neutron)
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Magic School 魔法学校. What does Harry Potter have on...? math
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Hiroyuki Yamada (Japan Agency for Marine-Earth Science and Technology) With thanks to: Tomoe Nasuno, Wataru Yanase, Masaki Satoh, Kunio Yoneyama, and Ryuichi