by msander | Aug 2, 2017 | Gr. 11-12 Chemistry
Introduction Studies of radioactivity at the beginning of the 20th century made it possible to investigate the actual structure and mass of atoms. Gradually, evidence began to build that atoms of the same element could have different masses. These atoms were called...
by msander | Jun 15, 2017 | Gr 4-6 Science & Tech, Gr 7-8 Science & Tech, Gr 9-10 Science, Gr. 11-12 Chemistry
Ancient skeletons can tell us a great deal about the past, including the age, gender and even the social status of its former owner. But how can we know all of these details simply by examining some old, soil-caked bones? Farnaz Khatibi examines a fascinating branch...
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