Second graders, for example, should do about 20 minutes ... On the other hand, some studies he examined showed that homework can cause physical and emotional fatigue, fuel negative attitudes ...

For the last 10 years, my colleagues and I have been investigating international patterns in homework using databases like the Trends in Mathematics and Science ... For example, in some nations ...

This article was originally published with the title “ Mathematics in the Physical Sciences ” in Scientific American Magazine Vol. 211 No. 3 (September 1964), p. 128 doi:10.1038 ...