A simple throwing task is described to illustrate various aspects of projectile motion. The task was to throw a tennis ball in a waste paper bin about 2 m away. Success depends on skill, but it also depends on the physics of the problem. If the ball is thrown underarm, then success depends primarily on the throw speed, which must be controlled to…

Background: Emergency contraception (EC) is a highly effective form of birth control that may lower rates of unintended pregnancy among young women. But efforts to disseminate EC to women are hampered by misinformation and inadequate information. Purpose: The purpose of this study was to determine the sources from which young women learn about EC…

Guided notes covering lectures have been shown to improve note quality and increase scores on quizzes covering lecture material. We sought to determine whether guided notes would also be beneficial in helping students prepare for quizzes covering assigned readings. We evaluated the efficacy of guided notes for reading assignments on…

Purpose: Frequent sounds and frequent words are both acquired at an earlier age and are produced by children more accurately. Recent research suggests that frequency is not always a facilitative concept, however. Interactions between input frequency in perception and practice frequency in production may limit or inhibit growth. In this study, we…

A prevailing theory of mathematical problem solving predicts that children will be less accurate solving a + b = c + __ problems versus a + b = __ + c. However, this has never been tested directly. Because of low base rates, information combined from multiple studies can help improve estimation accuracy and precision. This study compared…

The purpose of this diagnostic accuracy study was to evaluate the sensitivity and specificity (among other indicators) of three universal screening approaches, including the Social, Academic, and Emotional Behavior Risk Screener (SAEBRS), a SAEBRS-based teacher nomination tool, and a multiple gating procedure (MGP). Each screening approach was…

This research examined the experiences of authors of academic journal articles in the educational sector of all eight universities in Finland. The ethical principles of peer review and best and worst review processes were in focus. Data were gathered by electronic questionnaire, which was completed by 121 respondents who represented well the…

Introduction: Individuals with visual impairments may use long canes for estimating distances and detecting gaps, obstacles, and texture patterns. The study presented here investigated whether length perception with canes is influenced by cane material. Methods: Visually impaired, sightedblindfolded, and sighted individuals (n = 30 for each group)…

Many teachers like to introduce the Bohr atom toward the end of an introductory physics course. This is an excellent idea, given the historic importance of Bohr's 1913 work, which provided the bridge from Planck's quantized interaction of matter and radiation (1900) to the full theory of quantum mechanics (1925-28). Unfortunately, the version of…

Purpose: The purpose of this study is to examine changes in English past tense accuracy and errors among Spanish-English bilingual children with typical development (TD) and developmental language disorder (DLD). Method: Thirty-three children were tested before and after 1 year to examine changes in clinically relevant English past tense errors…

While hierarchical machine learning approaches have been used to classify texts into different content areas, this approach has, to our knowledge, not been used in the automated assessment of text difficulty. This study compared the accuracy of four classification machine learning approaches (flat, one-vs-one, one-vs-all, and hierarchical) using…

Despite the overwhelming evidence that higher education data are nested at various levels, single-level techniques such as regression and analysis of variance are commonly used to investigate student outcomes. This is problematic as a mismatch in methodology and research questions can lead to biased parameter estimates. The purpose of this study…

We develop an end-to-end neural network-based computer vision system to automatically identify "where" each person within a 2-D image of a school classroom is looking ("gaze following"), as well as "who" she/he is looking at. Automatic gaze following could help facilitate data-mining of large datasets of…

The authors used a state-trace methodology to investigate the informational dimensions used to recognize old and conjunction faces (made by combining parts of separately studied faces). Participants in 3 experiments saw faces presented for 1 s each. They then received a recognition test; faces were presented for varying brief durations and…

To indicate that atomic weights of many elements are not constants of nature, in 2009 and 2011 the Commission on Isotopic Abundances and Atomic Weights (CIAAW) of the International Union of Pure and Applied Chemistry (IUPAC) replaced single-value standard atomic weight values with atomic weight intervals for 12 elements (hydrogen, lithium, boron,…