Coordinating between Graphs and Science Concepts: Density and Buoyancy

Graphs illustrating complex scientific relationships require students to integrate multiple concepts and visual features into a coherent understanding. We investigate ways to support students in integrating their understanding of density concepts through a graph that is linked to a simulation depicting the relationship between mass, volume, and density. We randomly assigned 325 8^th-grade students to 1 of 2 graphing activities. In the analyze condition, students plotted a set of data points selected to help clarify the relationship between mass, volume, and buoyancy, and then interacted with a guided simulation to improve their plotting accuracy. In the generate condition, students chose their own data points, and then interacted with a guided simulation to test and revise their choices. We found that, although analyze participants were more likely to construct accurate graphs, generate participants were more likely to develop a coherent understanding of density and buoyancy. Analyses of process data and interviews suggest that generate participants grappled with the mass-volume ratio by deliberately testing points and identifying patterns as they updated their understanding of science concepts. In contrast, analyze participants displayed less deliberate exploration of the graph space. We discuss how activities that integrate graph interpretation and concept refinement can deepen science learning.     

Suicide attempts among drug abusers.

The relationship between substance abuse and suicide is indicated by the high rate of attempted suicide among alcoholics and drug abusers as well as the increased likelihood of repeated attempts in these populations. This study reports on the psychological characteristics of male drug suicide attempters who are in treatment for their addiction problem. Data collected from 166 veterans included background information, symptoms, mood, social functioning, and attitude measures. Of the drug abuse patients, 26 percent reported having made a suicide attempt. These subjects were found to be significantly more depressed, angry, insecure, and anxious than the nonsuicide-attempt drug abusers. Treatment staff need to be sensitized to the possibility of repeated suicide attempts among substance abuse patients.