The Oil Drop Experiment: An Illustration of Scientific Research Methodology and its Implications for Physics Textbooks

The objectives of this study are:(1) evaluation of the methodology used in recent search for particles with fractional electrical charge (quarks) and its implications for understanding the scientific research methodology of Millikan; (2) evaluation of 43 general physics textbooks and 11 laboratory manuals, with respect to the oil drop experiment, based on seven history and philosophy of science criteria. Results obtained show that all the textbooks and manuals ignored the Millikan–Ehrenhaft controversy and in general lacked a history and philosophy of science perspective. In spite of the anomalous data, Millikan adhered to the guiding assumptions of his research program. Ehrenhaft's work strictly followed the logic of experimental observations. Although, Ehrenhaft's work approximated the traditional scientific method, the scientific community supported Millikan. General physics textbooks and laboratory manuals present the oil drop experiment as an example of the scientific method in which experimental data implicitly serves as an arbiter in the defense of Millikan. It is suggested that textbooks and manuals by including the Millikan–Ehrenhaft controversy and the methodology used in the search for quarks could enrich students' understanding of scientific research methodology, viz., experimental data do not always dictate the choice of a theory.     

Polysemy in the Domain-Specific Pedagogical Use of Graphs in Science Textbooks: The Case of an Electrocardiogram

Polysemy in graph-related practices is the phenomenon that a single graph can sustain different meanings assigned to it. Considerable research has been done on polysemy in graph-related practices in school science in which graphs are rather used as scientific tools. However, graphs in science textbooks are also used rather pedagogically to illustrate domain-specific textbook content and less empirical work has been done in this respect. The aim of this study is therefore to better understand polysemy in the domain-specific pedagogical use of graphs in science textbooks. From socio-cultural and cultural-historical perspectives, we perceive polysemy as irreducible to either the meaning-making (semiotic) resources provided by the graph or its readers who assign meaning to it. Departing from this framework, we simultaneously investigated: (a) the meanings 44 pre-university biology students assigned to the Cartesian plane of a graph that is commonly used as a pedagogical tool in Dutch high school biology textbooks (an electrocardiogram); (b) the semiotic resources provided by this graph; and (c) the educational practices of which it is supposedly a part according to the actions constituted by the textbooks that were to be conducted by students. Drawing on this case, we show polysemy in the pedagogical use of graphs in science textbooks. In turn, we show how this polysemy can be explained dialectically as the result of both the meaning-making resources provided by the textbooks and the graph-related practices in which students supposedly engaged by using their textbooks. The educational implications of these findings are discussed.     

Elementary science education library resources in graduate and undergraduate teacher education programs of new England

The purpose of this study was to compare elementary science education library resources available in graduate and undergraduate teacher education institutions in New England. A 31-item survey was sent to teacher education institutions certified to prepare elementary teachers. The survey had four components: (1) services (i.e., ERIC, computer search, etc.), (2) journal holdings/science (i.e., Science and Children, Science Education, etc.), and nonscience (i.e., Reading Teacher, Instructor, etc.), (3) resources available (i.e., elementary science textbooks, audio-visual materials, computer software, etc.), and (4) an open-ended question about what major resources were needed to help prepare preservice students to teach science. There was a 72% return rate from the 87 institutions. Data were analyzed by the FREQUENCIES and ONEWAY subprograms of SPSSX. Less than 34% of the non-graduate libraries had ERIC microfiche available, Dissertation Abstracts, and computer search capabilities services. There was significant difference between graduate and nongraduate institutions journal holdings for science education journals and indexes. The surveyed libraries had more elementary science textbooks published prior to 1980 than those published after 1980 and were severely lacking in computer software.     

Science,Coloniality, and “the Great Rationality Divide”

This article aims to analyze how science is discursively attached to certain parts of the world and certain “kinds of people,” i.e., how scientific knowledge is culturally connected to the West and to whiteness. In focus is how the power technology of coloniality organizes scientific content in textbooks as well as how science students are met in the classroom. The empirical data consist of Swedish science textbooks. The analysis is guided by three questions: (1) if and how the colonial history of science is described in Swedish textbooks; (2) how history of science is described; (3) how the global South is represented. The analysis focuses on both what is said and what is unsaid, recurrent narratives, and cultural silences. To discuss how coloniality is organizing the idea of science eduation in terms of the science learner, previous studies are considered. The concepts of power/knowledge, epistemic violence, and coloniality are used to analyze how notions of scientific rationality and modernity are deeply entangled with a colonial way of seeing the world. The analysis shows that the colonial legacy of science and technology is not present in the textbooks. More evident is the talk about science as development. I claim that discourses on scientific development block out stories problematizing the violence done in the name of science. Furthermore, drawing on earlier classroom studies, I examine how the power of coloniality organize how students of color are met and taught, e.g., they are seen as in need of moral fostering rather than as scientific literate persons.     

美国中学科学教科书中科学本质观的实证研究——以《科学入门》为例

科学本质教学是科学教育的重要目标。科学教科书作为科学教学的核心课程资源,对教师的课堂教学和学生科学本质观的形成发挥着重要作用。本文应用内容分析法对美国《科学入门》教科书中科学本质观的分析表明,该教科书呈现了较为完整的科学本质观;突出科学的实证性、暂定性与发展性;为科学划界,区分科学与非科学;显性呈现关于科学与技术的关系;注重体现社会文化对科学的影响;所呈现的科学观是实践优位的。该教科书呈现的科学本质观能够为我国理科教科书编写提供多方面的启示。     

Pseudohistory and Pseudoscience

The dangers of pseudoscience – parapsychology, astrology,creationism, etc. – are widely criticized. Lessons in the history of science are oftenviewed as an educational remedy by conveying the nature of science. But such histories canbe flawed. In particular, many stories romanticize scientists, inflate the drama of their discoveries,and oversimplify the process of science. They are, literally and rhetorically, myths.While based on real historical events, they distort the basis of scientific authority and fosterunwarranted stereotypes. Such stories are pseudohistory. Like pseudoscience, they promotefalse ideas about science – in this case, about how science works. Paradoxically, perhaps,the history of pseudosciences may offer an excellent vehicle for remedying such impressions. Characteristically, textbooks of science contain just a bit of history, either in an introductory chapteror, more often, in scattered references to the great heroes of an earlier age. From suchreferences both students and professionals come to feel like participants in a long-standinghistorical tradition. Yet the textbook-derived tradition in which scientists come to sensetheir participation is one that, in fact, never existed. –Thomas Kuhn, The Structure of Scientific Revolutions     

A method to quantify major themes of scientific literacy in science textbooks

Science textbooks are frequently used to convey a great deal of the information that students receive in science courses. They influence how science teachers organize the curriculum and how students perceive the scientific enterprise. An overreliance on these teaching aids often results in an overemphasis on terminology and vocabulary, and presents a false impression of the nature of science. As a result of their importance, a method was developed to assess the curricular emphasis in science textbooks. The procedure is explained in a 25-page manual to train researchers to determine the relative emphasis that has been given to (a) science as a body of knowledge, (b) science as a way of investigating, (c) science as a way of thinking, and (d) the interaction among science, technology, and society. Textbooks in the areas of life science, earth science, physical science, biology, and chemistry were used in the analyses. Interrater agreements of at least 80% and kappas of at least 0.73 were achieved in the content analyses among two experienced researchers and one science teacher who were given the training manual to learn the assessment procedure.     

The Oil Drop Experiment: Do Physical Chemistry Textbooks Refer to its Controversial Nature?

Most general chemistry textbooks consider the oil drop experiment as a classic experiment, characterized by its simplicity and precise results. A review of the history and philosophy of science literature shows that the experiment is difficult to perform (even today!) and generated a considerable amount of controversy. Acceptance of the quantization of the elementary electrical charge was preceded by a bitter dispute between R.A. Millikan and F. Ehrenhaft, that lasted for many years (1910–1925). The objective of this study was to investigate whether physical chemistry textbooks refer to the controversial nature of the experiment. Based on six criteria developed previously, 28 physical chemistry textbooks were evaluated. Analysis of the texts using six identified criteria demonstrated that the textbooks neither referred to the controversial nature of the experiment nor recognized the difficulty of the experimental procedure. Only a few texts even attempted to include any discussion of the history or philosophy of the experiment. The instructor of a physical chemistry course could include aspects of the Millikan–Ehrenhaft controversy to motivate classroom discussion and help facilitate an understanding of the role that controversy has in scientific progress.     

The education of Spanish entrepreneurs and managers: Madrid and Barcelona business schools, 1950–1975

ABSTRACT

For some time now, images in science have been an object of study in the history of science. The multiple roles that images play in scientific practice have been recognised and discussed. However, little attention has been given to science related images in educational contexts. The case of geology is all the more relevant because it is considered that it has a specific visual language that is intrinsic to its own constitution as a science. This work aims to contribute to counter this situation through the analysis of geology-related images present in textbooks for Portuguese secondary education in the period between 1836 and 1974. Temporal limits correspond to the creation of secondary education in Portugal and to the end of the Estado Novo. For this period, five textbooks were chosen and their images analysed. The place of geological subjects in the context of science teaching in Portuguese secondary education was also traced. The interpretation of the results shows that images present in textbooks had other purposes besides introducing students to the typical visual language of geology. In fact, one of their main intentions was to “shape” the student’s mind into a “rational way of thinking”.     

Textbooks of doubt: using systemic functional analysis to explore the framing of climate change in middle-school science textbooks

Middle school students are learning about climate change in large part through textbooks used in their classes. Therefore, it is crucial to understand how the language employed in these materials frames this topic. To this end, we used systemic functional analysis to study the language of the chapters related to climate change in four sixth grade science textbooks adopted in the state of California. The linguistic variables investigated were: types of nominal groups; processes; circumstances; and the modality system. Our findings showed that these textbooks framed climate change as uncertain in the scientific community – both about whether it is occurring as well as about its human-causation. The implications for science education are discussed in relation to how the current political and public discourses of climate change, rather than the scientific discourse, is influencing how textbooks discuss this topic.     

High School Students' Critical Evaluation of Scientific Resources on the World Wide Web

This research explores a new web-based curriculum idea, that of having students write and publish critical web reviews of scientific resources as a means of both practicing critical evaluation of web resources, and of making an authentic value-added contribution to the web. This paper presents content analyses of selected sections of 63 web reviews published by eleventh grade students in a project-based science class. Two aspects of critical evaluation are focused upon: summarization of content and evaluation of credibility. Content analyses show that student summaries were usually accurate, but had room for improvement especially in areas of comprehensiveness and level of detail. An ideal model of a content review is developed from analysis of a second set of reviews. When asked to evaluate credibility, students struggled to identify scientific evidence of claims in web resources, but analysis of web documents shows that this is often because such evidence is missing. Students could accurately determine the publishing source of web documents, but challenges arose in identifying potential biases. Recommendations for future iterations of this curriculum idea are presented throughout. A companion paper that will appear in this journal will examine how student reviews serve the function of social filtering on the web.