Paleontology: Outrunning Time

In this paper, I discuss several temporal aspects of paleontology from a philosophical perspective. I begin by presenting the general problem of “taming” deep time to make it comprehensible at a human scale, starting with the traditional geologic time scale: an event-based, relative time scale consisting of a hierarchy of chronological units. Not only does the relative timescale provide a basis for reconstructing many of the general features of the history of life, but it is also consonant with the cognitive processes humans use to think about time. Absolute dating of rocks, fossils, and evolutionary events (such as branching events on the tree of life) can be accomplished through the use of radiometric dating, chronological signals extractable from fossil growth patterns, and the “molecular clock.” Sometimes these different methods of absolute dating, which start from largely independent assumptions and evidentiary bases, converge in their temporal estimates, resulting in a consilience of inductions. At other times they fail to agree, either because fossils and molecules are giving temporal information about different aspects of nature and should not be expected to agree, or because of flawed assumptions that give rise to an inaccurate estimate. I argue that in general, despite the fact that it can be difficult to integrate disparate kinds of evidence, the principle of total evidence should be applied to the dating of evolutionary events. As a historical science, paleontology studies past events we cannot observe directly. This raises questions of epistemic access, meaning that due to the fragmentary nature of the fossil record we may find ourselves without access to the relevant traces to adjudicate between rival hypotheses about the past. The problems and prospects of epistemic access are explored through a case study of the reconstruction of the colors of dinosaurs. The paper closes with a reflection on the Darwin- Lyell metaphor of the fossil record as a highly fragmentary history book, and a call for a reconsideration of the book metaphor in favor of a systems view of the geologic and fossil records

Methodology and ontology in microbiome research

Research on the human microbiome has gen- erated a staggering amount of sequence data, revealing variation in microbial diversity at the community, species (or phylotype), and genomic levels. In order to make this complexity more manageable and easier to interpret, new units—the metagenome, core microbiome, and entero- type—have been introduced in the scientific literature. Here, I argue that analytical tools and exploratory statisti- cal methods, coupled with a translational imperative, are the primary drivers of this new ontology. By reducing the dimensionality of variation in the human microbiome, these new units render it more tractable and easier to interpret, and hence serve an important heuristic role. Nonetheless, there are several reasons to be cautious about these new categories prematurely ‘‘hardening’’ into natural units: a lack of constraints on what can be sequenced metagenomically, freedom of choice in taxonomic level in defining a ‘‘core microbiome,’’ typological framing of some of the concepts, and possible reification of statistical constructs. Finally, lessons from the Human Genome Project have led to a translational imperative: a drive to derive results from the exploration of microbiome variation that can help to articulate the emerging paradigm of per- sonalized genomic medicine (PGM). There is a tension between the typologizing inherent in much of this research and the personal in PGM

Middle Level Education Aims for Equity and Inclusion, but Do Our School Websites Meet ADA Compliance?

An often-overlooked component of a middle school website is the necessity for that website to be accessible to those with disabilities, while following the guidelines of the Americans with Disabilities Act (ADA) and Section 508 of the Workforce Rehabilitation Act. In support of the belief that support the belief that inclusive education and respect for diversity should be integrated throughout the school, this study investigated the accessibility of middle school websites in Indiana, Kentucky, and Ohio by selecting a random sample of 150 schools and analyzing their homepages using WAVE (Web Accessibility Versatile Evaluator), which reports accessibility violations by annotating a copy of the page that was evaluated and presenting embedded icons and indicators to disclose breaches with ADA. Out of 150 districts, 54% had errors that need immediate attention and all 150 schools had alerts of likely violations that ranged from alt-text omissions and empty or confusing links to issues with color contrast and keyboard-only navigation. The article proceeds to give practical suggestions for eliminating many of the errors, even for those shareholders with less than sophisticated technological expertise

The Pervasive Nature of Animal Law: How the Law Impacts the Lives of People and their Animal Companions

Faculty members at Valparaiso University School of Law who attain the rank of full professor are expected to deliver an inaugural lecture to the University community and the public at large. This article is based on that lecture, delivered on September 25, 2008. This Article begins by distinguishing between “animal law,” “animal rights,” and “animal welfare” and discussing the growth of the field of animal law. It continues by setting forth the statistics on the number of companion animals in the United States (“U.S.”) and information about the households who have companion animals. The remainder of the article analyzes some of the legal issues impacting humans who have animal companions

Canines in the Classroom Revisited: Recent Developments Relating to Students\u27 Utilization of Service Animals at Primary and Secondary Educational Institutions

In April 2010 the author presented an article on the topic of the use of service animals by juveniles in a specific environment — primary and secondary educational institutions at the Mid-Atlantic Regional Animal Law Symposium. Since that time there have been important legislative and case law developments in this field. This Article focuses on those recent developments. After setting forth a basic overview of the issue, the Article analyzes the amendments to the regulations of the Americans with Disabilities Act (“ADA”) relating to service animals that became effective in March 2011. The Article then considers recent case law and other indications of how agencies of the federal government interpret the issue. The Article continues by examining state laws enacted to allow for a right for students with disabilities to be accompanied by service animals in schools. The Article concludes by providing guidance for student advocates and school administrators dealing with this issue