Cohomology for Anyone

Crystallography has proven a rich source of ideas over several centuries. Among the many ways of looking at space groups, N. David Mermin has pioneered the Fourier-space approach. Recently, we have supplemented this approach with methods borrowed from algebraic topology. We now show what topology, which studies global properties of manifolds, has to do with crystallography. No mathematics is assumed beyond what the typical physics or crystallography student will have seen of group theory; in particular, the reader need not have any prior exposure to topology or to cohomology of groups.Comment: 21 pages + figures, bibliography, Mathematica code homology.

Indirect genetic effects should make group size more evolvable than expected

Open Access via the OUP Agreement No data were used in this work.Peer reviewe

Insights from the study of complex systems for the ecology and evolution of animal populations

D.N.F. thanks Jack W. Bradbury and Sandra L. Vehrencamp for writing the article that originally stimulated his thoughts in this area. The authors are also grateful to Simon Denomme-Brown, Gustavo Betini and Elizabeth Hobson for reviewing drafts of this article, and Andrew G. McAdam for allowing D.N.F. to pursue this project despite employing him to study squirrels. Four anonymous reviewers provided useful comments that helped improve the manuscript. We have no conflicting interests.Peer reviewedPublisher PD

Indirect genetic effects clarify how traits can evolve even when fitness does not

Acknowledgmenets We thank Cortland Griswold, Loeske Kruuk, Alastair Wilson, Piter Bijma, Lucas Marie-Orleach, Joel McGlothlin, and an anonymous reviewer for comments and discussions that helped to improve this manuscript. The authors declare no conflicts of interest.Peer reviewedPublisher PD

A description of the gross pathology of drowning and other causes of mortality in seabirds

Contributions to the cost of post-mortem examinations were made to VRS by Natural England and by Cornwall Wildlife Trust Marine Strandings Group. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.Peer reviewedPublisher PD

Using multilayer network analysis to explore the temporal dynamics of collective behavior

This work was supported by the National Science Foundation IOS grant 1456010 and the National Institute of Health grant GM115509 to N.P.-W.Peer reviewedPublisher PD

Building a Foundation for Positive Psychology in Schools

Abstract Teachers in a large, non-urban school system completed one or more positive psychology questionnaires assessing strengths of character; happiness; orientation toward pleasure, engagement, and meaning as three different paths to happiness; explanatory style; orientation toward teaching as a job, a career, or a calling; and job satisfaction. These results of these 170 participants are compared with those obtained from an Internet sample of 2,538 teachers on four of the same instruments. Correlations between the results for each of the two samples are examined. The resulting profiles of the two samples are compared, and suggestions are made as to possible uses of such data to guide improvement in large school systems

Wild cricket social networks show stability across generations

Funding for this research was provided by NERC (studentship no.: NE/H02249X/1; grant no.: NE/H02364X/1).Peer reviewedPublisher PD