Evolutionism and the Teaching of Science: How Portugal Has Been “Playing with the Big Tree of Evolution”
© Springer Science+Business Media, LLC 2012
Published: 29 August 2012
The concept of evolution is fundamental to the teaching of biological sciences. Nevertheless, it seems frequently neglected and/or forgotten in our classrooms and absent from the school syllabus. These difficulties are present today in the Portuguese educational system, especially concerning the issue of human evolution. To overcome this difficulty, a multidisciplinary pilot project entitled Playing with the Big Tree of Evolution was developed by a nonprofit association called Group of Studies in Human Evolution in Portuguese schools and in other public and private organizations. Combining non-formal and informal apprenticeship, the project is composed of a set of pedagogical and experimental activities that aim to promote the broad concept of human evolution as well as to demystify the anthropocentric perspective that places humans at the top of the chain of life.
Since time immemorial, humans have questioned their origin and cosmological place in the universe (Mayr 2001; Cela-Conde and Ayala 2007). The first explanations about life's diversity and the emergence of humanity relied on the driving force of elements or were attributed to supernatural entities (Lewin 1993; Mayr 2001, 2004; Wood 2005; Jurmain et al. 2009; Nickels 2010). Only in the nineteenth century, after the publication of the book On the Origin of Species by Natural Selection by Charles Darwin in 1859, did this scenario begin to be demystified (Lewin and Foley 2004). According to the new theory, all living forms are not immutable throughout time, but the result of a long evolutionary process constantly regulated by natural selection (Mayr 2004); in the case of modern humans, a journey that started probably five to eight million years ago (Wood 2005; Jurmain et al. 2009).
Human origins and evolution can be portrayed as a shifting puzzle, remarkably fascinating but far from being complete. In the challenging goal of reconstructing our evolutionary past, the recent fossil discoveries as well as the introduction of new tools of research, have played a major role. For example, we can point to the new ancestor candidate of the genus Homo, the Australopithecus sediba discovered in 2010 in South Africa (Berger et al. 2010). Composed of two partial skeletons, this new species aged 1.95 to 1.78 million years, displays a mosaic of craniodental and postcranial features that makes it a possible descendent of Australopithecus africanus and the best candidate for the early Homo ancestors (Berger et al. 2010; Carlson et al. 2010; Pickering et al. 2010; Kibii et al. 2010; Kivell et al. 2010; Zipfel et al. 2010). In 2008, the extraction of ancient mtDNA from a finger bone found in southern Siberia (Denisova Cave) also revealed unexpected results since it allowed the identification of a new archaic hominin 1.9 million years old (Krause et al. 2010; Reich et al. 2010). The genetic mapping of the phalange and its comparison with Neanderthal and modern human mtDNAs led to the conclusion that the Denisova individual shared a common ancestor with Neanderthals and anatomically modern humans but possesses a distinct evolutionary history, thus representing a new hominin form (Krause et al. 2010; Reich et al. 2010).
The concept of evolution is fundamental in the teaching of biological sciences in a way that goes beyond scientific explanations (Rudolph and Stewart 1998; Kennedy et al. 2004; Nickels 2010). According to Kennedy et al. (2004, p. 3): “biological evolution accounts for three of the most fundamental features of the world around us: the similarities among living things, the diversity of life, and many features of the physical world we inhabit.” Thus, teaching biology without mentioning evolution deprives students of an important concept that brings order to our knowledge of life (Kennedy et al. 2004). Although the role of evolution is unquestionable, it frequently seems neglected and/or forgotten in the classrooms and by our students (Coalition of Scientific Societies 2008; Smith 2010). Ideological and religious views or simple unawareness are the main reasons for it (Coalition of Scientific Societies 2008). In addition, the old-fashioned textbook-based approach (Bloom 2006); the lack of updated books; and the discretionary relevance given to the subject can also contribute to intensifying the problem. These difficulties are present in the Portuguese educational system, especially in regard to the issue of teaching human evolution. To help in overcoming this difficulty, a multidisciplinary pilot project entitled Playing with the Big Tree of Evolution [Brincar com a Grande Árvore da Evolução] was developed and implemented in Portuguese schools, museums, and in other public and private institutions. Thus the aims of this paper are twofold: first, to outline the current situation concerning the teaching of evolution in Portugal and second, to present the project, describing the main activities and achievements following five years of execution.
Teaching Evolution in Portugal
The teaching of evolution is considered vital in the scholarly learning processes (Almaça 1999). According to Jenkins (2009), the natural sciences must be permeable to evolutionary theories since evolution is the key concept to understanding the living world. The theory of evolution can be portrayed as the aggregating factor of scientific instruction (Smith 2010; Yetişir and Kahyaoğlu 2005), allowing educators to differentiate science from other forms of human thought (National Academy of Sciences 1998). Evolutionary theory underscores the truly interdisciplinary face of science; furthermore, it offers a group of tools that enables students to explore the surrounding environments, and leads alumni to think about fundamental questions: “why things are the way they are currently and how they came to be that way” (Jenkins 2009, p. 347). However, throughout time, we have witnessed a decrease of interest in this central topic of natural sciences in the Portuguese school curriculum (Bracinha Vieira 2009). A quick survey of the web site of the Portuguese Ministry of Education and Science [available at: http://www.portugal.gov.pt/pt/os-ministerios/ministerio-da-educacao-e-ciencia.aspx], namely at the Direção Geral de Inovação e de Desenvolvimento Curricular [available at: http://www.dgidc.min-edu.pt/index.php] reveals that evolution, evolutionism, and generic Darwin’s theory are topics that presently have an almost residual weight in the syllabus. In the particular case of human evolution, there was a reverse, comparing the current curriculum with the ones taught during the 1990s. At that time, the appearance of the first hominins, their main characteristics, habitats, and the origin of technologies were taught in the first year of secondary school as part of the history program. Today, the governmental program recommends: “a simplified analysis of the history of humanity. A circumscriptive study of the most fundamental moments is proposed, without analysis of the evolutionary process per se. This decision is motivated by factors linked with the psychological development of students and as a measure of economy of time in the class timescale” (Ministério da Educação 2009, p. 15). Furthermore, teachers are advised to focus on the social, technological, and economic transformations that occurred throughout the history of humankind instead of focusing on the biological changes that took place during human evolution (Ministério da Educação 2009). A simple overview of evolutionary principles related to the Earth’s history is also recommended in the first year of secondary school in the class of life sciences (Galvão et al. 2001). At the end of secondary school, evolution returns as content in the classes of biology/geology as part of the sciences and technology program. Again, differences are found compared to the former Portuguese programs. For example, in the curricular year of 1995/1996, the subject of evolution was optional and taught in the beginning of the course. In the current program, it is relegated to the penultimate unit of the year syllabus and starts with a sentence that can be misleading: “There is no agreement about the forces that are responsible for biological diversity” (Mendes et al. 2004, p. 11). Additionally, teachers are advised that deep analysis of evolution theories should be avoided (Mendes et al. 2003).
Despite the “public” acceptance of Darwin’s theory, Portuguese scientists say the acceptance it is only superficial (Bracinha Vieira 2009). Several reasons may explain the current situation: (1) naive interpretations of evolution; (2) ideological and religious views or simple unawareness; (3) old-fashioned textbook-based approach; (4) lack of updating concerning the newest discoveries; and (5) optional nature of this topic in biology classes (Bracinha Vieira 2009; Smith 2010). Other factors seem to reside in the apparent cleavage between the scientific community and ensuing knowledge produced in universities and research centers and the schools and/or general public. Accordingly, an interface between scientists and public is needed, which may be achieved by the introduction of informal and non-formal routes of science apprenticeship.
The Portuguese project Playing with the Big Tree of Evolution: Description and Main Achievements
Considering all the difficulties faced by Portuguese instructors in teaching evolution, as well as the interdisciplinary background required to do it, a nonprofit scientific organization called Group of Studies in Human Evolution (GEEvH) [http://geevh.jimdo.com/] was created in 2005 by a group of students using the Master Course in Human Evolution (class 2004–2006) syllabus from the former Department of Anthropology at the University of Coimbra, Portugal. One of the main goals of the association is the scientific and pedagogical promotion of studies in Human Evolution. To fulfill this goal, efforts were made to disseminate Darwin’s theory in schools, museums and among the general public by focusing on distinct disciplines since Darwin was himself an interdisciplinary thinker who consistently bridged geology, botanic, zoology, paleontology, embryology, ethology, and evolutionary systems in his theory (Bracinha Vieira 2009). As a result, a voluntary and multidisciplinary project centered on the topic of human evolution was developed in 2005 by the GEEvH. The project, entitled Playing with the Big Tree of Evolution was created within the scope of a national program called Ciência Viva VI from the former Ministry of Science, Technology and High Degree, embracing a non-formal and informal apprenticeship. The project was composed of a set of pedagogical and experimental workshops that aimed to promote the broad concept of human evolution as well as to demystify the anthropocentric perspective that places humans at the top of the chain of life, embracing the idea that evolution is not a straight road but is a casual and unexpected event that needs constant updates.
Descriptive summary of some of the activities developed during the project Playing with the Big Tree of Evolution
Workshop 1: “Evolution: at the first we were one …”
Goal: to address the wonderful and still-unfolding story which started with the origin of the Universe.
Keypoints focused on: Big Bang and the origin of the Universe; the formation of the planet Earth and the origin of the first life forms; theories for the origin and diversity of life: Creationism vs. Evolution; Evolutionism and the role of the fossil evidence; introduction to the kingdoms of life,
Pedagogical activities: Game 1, The little naturalist: children will attempt to regroup several organisms, previously drawn and colored on paperboard, in kingdoms. Game 2, Let’s play fossils...: fossils will be made in plaster simulating ammonites and trilobites and painted by children (Fig. 1).
Workshop 2: “Fossils: our grandparents”
Goals: to understand the evolutionary process through phylogenetic information derived from our closest relatives—primates—and fossils; to understand human origins and our ancestors, their main characteristics, habitats, and evolutionary adaptations.
Keypoints focused on: What are fossils and how are they formed? How do we understand human evolution? Inferences based on the study of nonhuman primates (phylogeny and taxonomy) and hominin fossil remains. Us and our closest relatives: locomotion, encephalization, tool use, and language.
Pedagogical activities: Game 1, From Pan to Homo: The game aims to consolidate knowledge about the main steps of human evolution. The game comprises a physical activity circuit and questions related to the oral presentation (Fig. 2). Game 2, Human Evolution Jeopardy Quiz: This interactive quiz is composed of several questions about the human evolution journey and is played by two distinct teams formed at the beginning of the workshop.
Workshop 3: “Dance of the skeletons”
Goals: To introduce the role of the skeleton in the physiological balance of the human body; to clarify the importance of recovering human skeletal remains from archaeological contexts to reconstruct past populations’ history and evolution.
Keypoints focused on: basic notions of human osteology: What is the skeleton? What are bones made of? How does the human skeleton develop during fetal life? How many bones do children and adults have? What are the main function of the skeleton and joints? Short introduction to the work of the biological anthropologist in the field, during the recovery of the skeletal remains, and in the laboratory, focusing on the type of information that can be retrieved from ancient bones (e.g., sex and age at death of the individuals, ancestrality, diseases, diet, among others).
Pedagogical activities: Game 1, Bone’s Dance: roll-and-move game comprised of several questions that finishes in the simulation of an excavation in a sandbox (Fig. 3).
Workshop 4: “Monkey business”
Goals: To present the taxonomic classification of the Order Primates; to introduce our closest living relatives; to reveal the importance of knowing nonhuman primates and the need to preserve their habitat.
Keypoints focused on: All are primates, but only some are monkeys: nomenclature and taxonomy of Primates. Our closest relatives: phylogeny of chimpanzees and humans, main differences, and similarities. What is the importance of studying the behavior of nonhuman primates? The importance of preserving habitats and their inhabitants.
Pedagogical activities: Game 1: Can you do it like they do?: The game intends to recreate some tool-use behaviors observed in wild chimpanzees, like termite-fishing and nut-cracking (Fig. 4).
Workshop 5: “Drawings and scribbles—Prehistoric art”
Goals: The concept of Art is applied to demonstrate prehistory’s symbolic and social behavior. Being conceived as a “spirit transcends nature,” art expresses itself by creating works with goals other than the satisfaction of subsistence needs. Art allows aesthetic expression linked with symbolic and playful behaviors.
Keypoints focused on: Prehistoric art: An introduction; Paleolithic and Late Prehistoric “Art”: Notion, concept, topics, and techniques.
Pedagogical activities: Game 1: Our hands on paint: preparation of pigments and tools for painting (Fig. 5).
The project was coordinated by researchers (volunteers) from the social and natural sciences and intended to be a scientific vehicle accessible to all students. By developing workshops and activities in non-formal and informal ways, these researchers proposed to introduce new topics and reach for knowledge in an entertaining way, not only among students but also among the general public that usually does not have access to this kind of scientific information. According to the educational level, there was always an attempt to adjust the complexity of the subjects by guiding the discourse and simplifying the explanations and workshops.
The year 2006 accounted for 19% (314/1678) of the participants and coincided with the special involvement of the GEEvH in an exhibition about human evolution entitled “Habitants e habitats” [Inhabitants and habitats] organized by the municipality of Leiria. In the year of 2009, two major events garnered almost 63% (1,055/1,678) of the participants, namely, the event Sobre as pegadas do passado [Upon the past footsteps] promoted by the former Anthropological Museum—Museum of Natural History from the University of Coimbra—and the pedagogical activities that took place at the Museum D. Diogo de Sousa in the city of Braga, Northern of Portugal. Both events had the partnership and support of the Research Centre for Anthropology and Health at the University of Coimbra. From the 18 administrative districts of continental Portugal, six were covered by the project, such as Braga and Guarda (in the north); Viseu, Coimbra and Leiria (in central Portugal), and Lisbon (in the south). During the implementation of the project, the following were observed: (1) great interactivity, not only during the presentation, but also when the students were asked to apply the acquired knowledge in practical activities; (2) fast acquisition of concepts and theories; (3) interconnection between the new and the previous knowledge; and (4) a much larger demand than the possible supplied workshops: Most of the institutions targeted by these activities expressed their will to have access to more workshops, which was not always possible due to the volunteer nature of this work. Furthermore, the pedagogical nature of these activities was viewed by teachers and educators as a good complement to their formal school programs. Activities that need further restructuring are those directed to the public with special needs, namely in the adequacy of the discourse.
Scientific research, especially that devoted to the study of human evolution, is one of the most active fields that is in constant mutation in biology (Kennedy et al. 2004). This reality makes the teacher’s work more complex. Although an irreplaceable role is played by the official school in education, there are other opportunities beyond the textbook approach using non-formal and informal apprenticeships in science created by distinct institutions such as the media, science centers and museums, industry-education programs, out-of-school programs, and community educational initiatives (Honeyman 1998; Bloom 2006). This wider approach inspired the creation of the project Playing with the Big Tree of Evolution as a novel route of promoting human evolutionary studies in schools and among the general public. After five years of activity, it is possible to conclude that this type of approach is well accepted by the community, constituting an optimal complement to the formal teaching; one that can be easily be adapted to other fields of biology and life sciences. Focusing on the Portuguese case, one feels that more initiatives need to be developed in similar areas in order to fill the gaps that may exist in school programs, and foremost, to spread the message that: Science is not grey; on the contrary, it is colorful and fun!
We would like to thank the Office of the Board of the Grupo de Estudos em Evolução Humana, associates, school and museum staff, teachers, students, volunteers, and monitors that have participated in the workshops; CIAS-Research Centre for Anthropology and Health from the University of Coimbra, Municipality of Leiria, and Museu D. Diogo de Sousa (Braga) for all the material support. Special thanks go to Dra. Maria Arminda Miranda. The acquisition of supplies was funded by the Ciência Viva VI, former Ministry of Science, Technology and High Degree, code reference CV/PVI 1845.
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