This meta-analysis provides an extensive and organized summary of intervention studies in education that are grounded in motivation theory. We identified 74 published and unpublished papers that experimentally manipulated an independent variable and measured an authentic educational outcome within an ecologically valid educational context. Our analyses included 92 independent effect sizes with ...

admission of failure, there is a definite psychologic advantage in change. The use of skimmed, powdered, evaporated, protein, on acidified milk is also occasionally helpful in colic. During the neonatal period, the experienced pediatrician can often recognize the characteristics in an apprehensive mother that will result in a colicky baby. Family tension is undoubtedly a fairly common cause, an...

Leukemia is essentially a blood disease in which there is more or less enlargement of the blood and lymph forming organs. There is usually a very marked increase in the number of white blood corpuscles with a possible decrease in the number of red cells. Leisering ^ is credited with being the first to demonstrate the presence of leukemia in animals in 1858, but from an investigational standpoin...

Cold-formed steel roof truss systems that use complex stiffener patterns in existing hat shape members for both top and bottom chord elements are a growing trend in the North American steel framing industry. When designing cold-formed steel sections, a structural engineer typically tries to improve the local buckling behavior of the cold-formed steel elements. The complex hat shape has proved t...

As the preliminary results of experimental studies on dust from the palygorskite group have led to some confusion a detailed description of the completed investigation is given for clarification. As in other experiments the biological effects have been shown to be associated with the physical characteristics of the fibres in these specimens. Samples of sepiolite and attapulgite from Spain and a...

Extinction of populations occurs naturally, but global extinction rates are accelerating, making understanding extinction a high priority for conservation. Extinction in experimental populations of brine shrimp (Artemia franciscana) was measured to assess hypothesized extinction processes. Greater initial population size, greater maximum population size supported by the environment, and lower v...