Discusses the technique of producing a grating with a spacing of 1 micron and 5 slits 50 microns long and 0.3 micron wide. Indicates that the slits are suitable for use in examination of electron diffraction patterns in the Gedanken experiment. (CC)

Following the supposition that study of a subject through a specific problem is an effective way to develop thinking, the author advocates classroom experimentation that requires the student to put forth a hypothesis, test its validity, advance a theory, and try a new problem. (JH)

The relative effectiveness of learning aids as measured by tests for achievement, transfer of acquired skills to novel situations, and ability to retain principles for students of varying abilities and age levels were examined in a series of studies at George Peabody College for Teachers. (Author)

Author proposes the development of an experimental teacher education model which could be considered as an alternative or option to many present student teaching opportunities. (GB)

The comparative effectiveness of an aversive stimulus, withholding of resources, withdrawal of love, and reasoning, when used alone and when combined with praise, was assessed in a standard laboratory punishment paradigm with first and second grade children. (CS)

Discusses an experiment which illustrates the non-mixing properties of water at normal temperature with oil because of water's strong, open-ended hydrogen bonding interactions. Examples of the mixing properties between non-interacting substances and the near-complete mixing between water and solvents with limited H-bonding capacity are also given.…

Results of four experiments assessing the contributions of rehearsal, modeling, and coaching to an experimental assertion-training program are reported. (Author)

Describes major programs carried out by the National Bureau of Standards to solve problems relating to energy resources, technological innovation, public health protection and unit standardization. (CC)