The History Major and Undergraduate Liberal Education

Argues that the study of history integrates disciplinary knowledge, methods, and principles into a broad education and civic engagement. Recommends that departments set goals for student outcomes, diversify course requirements, and emphasize teaching

An Economic Analysis of Children's Health and Intellectual Development

The basic purpose of our research is to contribute to an understanding of the joint determination of children's cognitive development and their health. Although there is a large literature concerning the first of these issues, there has been little work on the latter. We also explore interrelationships between various aspects of children's physical health and their intellectual development and, in particular, attempt to answer the important question of whether poor health retards the cognitive development of children.

Experimental Signatures of Split Fermions in Extra Dimensions

The smallness and hierarchy of the fermion parameters could be explained in theories with extra dimensions where doublets and singlets are localized at slightly separated points. Scattering cross sections for collisions of such fermions vanish exponentially at energies high enough to probe the separation distance. This is because the separation puts a lower bound on the attainable impact parameter in the collision. The NLC, and in particular the combination of the e^+e^- and e^-e^- modes, can probe this scenario, even if the inverse fermion separation is of order tens of TeVs.Comment: 9 pages, latex, 2 figures. Invited talk presented at the 3rd International Workshop on Electron-Electron Interactions at TeV Energies (e-e-99), December, 1999, Santa Cruz, Californi

Adolescent Health, Family Background, and Preventive Medical Care

This paper investigates the health of white adolescents, focusing particularly on the roles of family background and preventive medical care. This emphasis is motivated in part by our desire to study adolescent health in the context of the nature-nurture controversy. The findings indicate first, that family characteristics (especially mother's schooling) do have a significant impact on adolescent health and second, that preventive care is an important vehicle for this impact in the case of dental health hut not in the ease of physical health measures. Similarly, the greater availability of dentists has a positive impact on dental health, but greater availability of pediatricians does not alter the physical health measures. On the basis of these results we predict that government efforts to improve the dental health of adolescents with policies to lower the cost of dental care or increase the availability of dentists are much more likely to be successful than similar policies directed at improving their physical health.

<a comparative study of the evolution of enzymes and nucleic acids< semi-annual status report, nov. 1, 1964 - apr. 30, 1965

Lactic dehydrogenases and protein immunochemicals in vertebrate evolution - irradiation of nucleic acid

An Exploration of the Dynamic Relationship between Health and Cognitive Development in Adolescence

This paper is an empirical exploration of the dynamic relationship between health and cognitive development in a longitudinal data set compiled from two nationally representative cross-sections of children. Our results indicate that there is feedback both from health to cognitive development and from cognitive development to health, but the latter of these relationships is stronger. They also indicate that estimates of family background effects taken from the dynamic model -- which can be assumed to be less influenced by genetic factors are smaller than their cross-sectional counterparts, but some still remain statistically significant. The first finding calls attention to the existence of a continuing inter-action between health and cognitive development over the life cycle. The second finding suggests that nurture "matters" in cognitive development and health outcomes.

Heterogeneities in the solar nebula

Oxygen isotopic compositions of the high-temperatue phases in carbonaceous chondrites define a mixing line with an O-16 rich component and show little superimposed chemical isotope fractionation. Within a single inclusion in Allende, variations of delta O-18 and delta O-17 of 39% are found. The ordinary chondrites are slightly displaced from the terrestrial fractionation trend, implying that at least 0.2% of the oxygen in terrestrial rocks was derived from the O-16 rich component

Microphysical, microchemical and adhesive properties of lunar material. 3: Gas interaction with lunar material

Knowledge of the reactivity of lunar material surfaces is important for understanding the effects of the lunar or space environment upon this material, particularly its nature, behavior and exposure history in comparison to terrestrial materials. Adsorptive properties are one of the important techniques for such studies. Gas adsorption measurements were made on an Apollo 12 ultrahigh vacuum-stored sample and Apollo 14 and 15 N2-stored samples. Surface area measurements were made on the latter two. Adsorbate gases used were N2, A, O2 and H2O. Krypton was used for the surface area determinations. Runs were made at room and liquid nitrogen temperature in volumetric and gravimetric systems. It was found that the adsorptive/desorptive behavior was in general significantly different from that of terrestrial materials of similar type and form. Specifically (1) the UHV-stored sample exhibited very high initial adsorption indicative of high surface reactivity, and (2) the N2-stored samples at room and liquid nitrogen temperatures showed that more gas was desorbed than introduced during adsorption, indicative of gas release from the samples. The high reactivity is a scribed cosmic ray track and solar wind damage