4.11 - 1251 ratings - Source

One teacher notes, aquot;A lot of the books and films available in the early stages of the program were mechanical and narrow. ... Since last June, a group of six science specialists and classroom teachers have been hard at the task of searching for effective ... In one test, elementary students make increasingly diluted solutions of sucrose and are asked to explain the changes in ... Using increasingly diluted mixtures of water and alcohol or water and tea, pupils can see the effects of varyinganbsp;...

Publisher: - 1972

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