Sex Differences in Elite Swimming with Advanced Age Are Less Than Marathon Running

The sex difference in marathon performance increases with finishing place and age of the runner but whether this occurs among swimmers is unknown. The purpose was to compare sex differences in swimming velocity across world record place (1st–10th), age group (25–89 years), and event distance. We also compared sex differences between freestyle swimming and marathon running. The world\u27s top 10 swimming times of both sexes for World Championship freestyle stroke, backstroke, breaststroke, and butterfly events and the world\u27s top 10 marathon times in 5-year age groups were obtained. Men were faster than women for freestyle (12.4 ± 4.2%), backstroke (12.8 ± 3.0%), and breaststroke (14.5 ± 3.2%), with the greatest sex differences for butterfly (16.7 ± 5.5%). The sex difference in swimming velocity increased across world record place for freestyle (P \u3c 0.001), breaststroke, and butterfly for all age groups and distances (P  \u3c 0.001) because of a greater relative drop-off between first and 10th place for women. The sex difference in marathon running increased with the world record place and the sex difference for marathon running was greater than for swimming (P \u3c 0.001). The sex difference in swimming increased with world record place and age, but was less than for marathon running. Collectively, these results suggest more depth in women\u27s swimming than marathon running

M. T. Joyner & Son- Mrs. R. H. Walker, September 19, 1928

Correspondence: From L.A. Joyner, M.T. Joyner & Son, 515 Main Street, Jacksonville, Florida, to Rosa G. Holmes Walker, Jacksonville, Florida, letter asking for a couple of days grace

Buckling without bending: a new paradigm in morphogenesis

A curious feature of organ and organoid morphogenesis is that in certain cases, spatial oscillations in the thickness of the growing "film" are out-of-phase with the deformation of the slower-growing "substrate," while in other cases, the oscillations are in-phase. The former cannot be explained by elastic bilayer instability, and contradict the notion that there is a universal mechanism by which brains, intestines, teeth, and other organs develop surface wrinkles and folds. Inspired by the microstructure of the embryonic cerebellum, we develop a new model of 2d morphogenesis in which system-spanning elastic fibers endow the organ with a preferred radius, while a separate fiber network resides in the otherwise fluid-like film at the outer edge of the organ and resists thickness gradients thereof. The tendency of the film to uniformly thicken or thin is described via a "growth potential". Several features of cerebellum, +blebbistatin organoid, and retinal fovea morphogenesis, including out-of-phase behavior and a film thickness amplitude that is comparable to the radius amplitude, are readily explained by our simple analytical model, as may be an observed scale-invariance in the number of folds in the cerebellum. We also study a nonlinear variant of the model, propose further biological and bio-inspired applications, and address how our model is and is not unique to the developing nervous system.Comment: version accepted by Physical Review

Growing Pains: Reflections at the Intersection(s) of Pedagogy and Self-Study in Whiteness Research in Education

In this paper we work to place personal reflections of ourselves as researchers in conversation with interview data generated from white practicing teachers. Our work seeks to engage what the praxis of pedagogical qualitative analysis, coupled with self-study, can offer other researchers. This paper thus has two primary aims: to investigate our research findings from the interview data and the teachers who participated in the professional development seminar, and to explore what such work makes available to us as white researcher/practitioners. We move back and forth between both in the pages that follow, as we hope to showcase what becomes possible when we blur the lines between researcher and researched, and the implications in particular for white researchers/teachers committed to combatting racism in their practice(s)

Maxent Estimation of Aquatic Escherichia Coli Stream Impairment

Background.The leading cause of surface water impairment in United States’ rivers and streams is pathogen contamination. Although use of fecal indicators has reduced human health risk, current approaches to identify and reduce exposure can be improved. One important knowledge gap within exposure assessment is characterization of complex fate and transport processes of fecal pollution. Novel modeling processes can inform watershed decision-making to improve exposure assessment

Designing Effective Legal Research Rubrics: The Foundation for Successful Assessment

Increasingly librarians are teaching many, if not all, of the legal research courses at their law schools. Most librarians are not experts in education assessment design. Assessment with rubrics creates a learner centric environments in which instructors objectively evaluate student progress and assures that students receive consistent and meaningful feedback. Rubrics provide both students and instructors with a clear understanding of whether learning outcomes have been achieved. Guided by the instructors\u27 experience and an in-depth review of the literature law librarians will be exposed to the best practices when creating rubrics including alignment with the course goals and instructor expectations

Abort Region Determinator (ARD) module feasibility report. Mission planning, mission analysis and software formulation

A detailed performance evaluation of the Abort Region Determinator (ARD) module design was provided in support of OFT-1 ascent and OFT-1 intact launch aborts. The evaluation method used compared ARD results against results obtained using the full-up Space Vehicle Dynamic Simulations program under the same conditions. Results were presented for each of the three major ARD math models: (1) the ascent numerical integrator; (2) the mass model, and (3) the second stage predictor as well as the total ARD module. These results demonstrate that the baselined ARD module meets all design objectives for mission control center orbital flight test launch/abort support