| http://www.w3.org/ns/prov#value | - In natural sciences, particularly in physics and chemistry, the equivalent of the exercises are the experiments and especially the laboratory work. [ 1 ] On teaching physics and chemistry the Ratio has one very important remark, viz., the professor should not treat them merely, theoretically and mathematically, so that no time is left for the experiments; nor should he, on the other hand, spend so
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