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Using longitudinal time diary and survey data from a community sample of dual-earner couples across the transition to parenthood, the authors examined change in divisions of paid and unpaid work and assessed the accuracy of survey data for time use measurement. Mothers, according to the time diaries, shouldered the majority of child care and did not decrease their paid work hours. Furthermore, the gender gap was not present prebirth but emerged postbirth with women doing more than 2 hours of additional work per day compared to an additional 40 minutes for men. Moreover, the birth of a child magnified parents' overestimations of work in the survey data, and had the authors relied only on survey data, gender work inequalities would not have been apparent. The findings have important implications for (a) the state of the gender revolution among couples well positioned to obtain balanced workloads and (b) the utility of survey data to measure parents' division of labor.

Emerging photonic functionalities are mostly governed by the fundamental principle of Lorentz reciprocity. Lifting the constraints imposed by this principle could circumvent deleterious effects that limit the performance of photonic systems. Most efforts to date have been limited to waveguide platforms. Here, we propose and experimentally demonstrate a spatio-temporally modulated metasurface capable of complete violation of Lorentz reciprocity by reflecting an incident beam into far-field radiation in forward scattering, but into near-field surface waves in reverse scattering. These observations are shown both in nonreciprocal beam steering and nonreciprocal focusing. We also demonstrate nonreciprocal behavior of propagative-only waves in the frequency- and momentum-domains, and simultaneously in both. We develop a generalized Bloch-Floquet theory which offers physical insights into Lorentz nonreciprocity for arbitrary spatial phase gradients, and its predictions are in excellent agreement with experiments. Our work opens exciting opportunities in applications where free-space nonreciprocal wave propagation is desired. Overcoming reciprocity is important for novel functionalities. Here, the authors demonstrate a spatio-temporally modulated metasurface capable of complete violation of Lorentz reciprocity by reflecting an incident beam into far-field radiation in forward scattering, but into near-field surface waves in reverse scattering.

Objective This article outlines for family scholars and researchers designing surveys or searching for data on sexual and gender‐diverse (SGD) families the latest methodological advancements in United States population‐based surveys for studying SGD partnerships by reviewing five recently collected, publicly available, population‐representative data sets. Background LGBTQIA+ adults and SGD partnerships are an expanding demographic group in the United States. Yet, measurement limitations have restricted studies of these partnerships that use population‐based studies. To address this issue, researchers designing population‐representative data collections have adopted new strategies to measure SGD partnerships accurately. However, most population representative surveys continue to lack data on growing segments of the LGBTQIA+ population by relying solely on the sex of partners or limited sexual and gender identity measures. Conclusion We recommend expanding population‐based surveys to incorporate inclusive measures of sexual and gender identity, directly asking about the gender composition of a couple and measurement of cohabiting and other nonmarital relationships. These approaches are especially important for understanding relationships among younger populations who do not follow heteronormative relationship trajectories and hold diverse gender and sexual identities. Implications Although the research opportunities on SGD individuals and partnerships are expanding; researchers must remain mindful of the limitations of current data sets and advocate for updates to the United States population data infrastructure.

High-quality father involvement in childrearing is associated with positive child outcomes. Yet, variability between fathers in parenting quality remains. The present study examined associations between maternal gatekeeping and fathers’ observed parenting quality in 182 dual-earner families who transitioned to parenthood in 2008–2009. Maternal gatekeeping, or beliefs and behaviors that may serve to discourage (gate close) or encourage (gate open) father involvement in childrearing, was measured using fathers’ reports at 3- and 9-months postpartum. Fathers’ parenting quality was assessed during a brief observational task at 3- and 9-months postpartum. A cross-lagged structural equation model, which included repeated measures of maternal gate closing, gate opening, and fathers’ parenting quality (i.e., sensitivity, detachment, and positive regard) at 3- and 9-months postpartum, revealed associations between maternal gatekeeping and fathers’ parenting quality. In particular, fathers who experienced greater gate closing at 3-months postpartum showed greater relative declines in parenting quality at 9-months postpartum. Of note, maternal gate opening at 3-months postpartum was not associated with fathers’ parenting quality at 9-months postpartum. Additionally, paths from fathers’ parenting quality at 3-months postpartum to maternal gatekeeping at 9-months postpartum were not significant. This is the first study to examine longitudinal associations between maternal gatekeeping and fathers’ parenting quality.

As divorce and cohabitation dissolution in the US have increased, partnering has expanded to the point that sociologists describe a merry-go-round of partners in American families. Could one driver of the increase in the number of partners be an intergenerational transmission of partnering? We discuss three theoretical perspectives on potential mechanisms that would underlie an intergenerational transmission of partnering: the transmission of economic hardship, the transmission of marriageable characteristics and relationship skills, and the transmission of relationship commitment. Using the National Longitudinal Survey of Youth 1979 Child and Young Adult study (NLSY79 CYA) and their mothers in the National Longitudinal Survey of Youth 1979 (NLSY79), we examined the intergenerational transmission of partnering, including both marital and cohabitating unions, using prospective measures of family and economic instability as well as exploiting sibling data to try to identify potential mechanisms. Even after controlling for maternal demographic characteristics and socioeconomic factors, the number of maternal partners was positively associated with offspring's number of partners. Hybrid sibling Poisson regression models that examined sibling differential experiences of maternal partners indicated that there were no differences between siblings who witnessed more or fewer maternal partners. Overall, results suggested that the transmission of poor marriageable characteristics and relationship skills from mother to child may warrant additional attention as a potential mechanism through which the number of partners continues across generations.

This study aims to evaluate the etiology of pediatric sensorineural hearing loss (SNHL). A total of 423 children with SNHL were evaluated, with the focus on the determination of causative genetic and acquired etiologies of uni- and bilateral SNHL in relation to age at diagnosis and severity of the hearing loss. We found that a stepwise diagnostic approach comprising of imaging, genetic, and/or pediatric evaluation identified a cause for SNHL in 67% of the children. The most common causative finding in children with bilateral SNHL was causative gene variants (26%), and in children with unilateral SNHL, a structural anomaly of the temporal bone (27%). The probability of finding an etiologic diagnosis is significantly higher in children under the age of 1 year and children with profound SNHL.Conclusions: With our stepwise diagnostic approach, we found a diagnostic yield of 67%. Bilateral SNHL often has a genetic cause, whereas in unilateral SNHL structural abnormalities of the labyrinth are the dominant etiologic factor. The diagnostic yield is associated with the age at detection and severity of hearing loss: the highest proportion of causative abnormalities is found in children with a young age at detection or a profound hearing loss.What is Known:• Congenital sensorineural hearing loss is one of the most common congenital disorders• Determination of the cause is important for adequate management and prognosis and may include radiology, serology, and DNA analysisWhat is New:• Using a stepwise diagnostic approach, causative abnormalities are found in 67% both in uni- and bilateral SNHL, with the highest diagnostic yield in very young children and those suffering from profound hearing loss• Bilateral SNHL often has a genetic cause, whereas in unilateral SNHL structural abnormalities of the labyrinth are the dominant etiologic factor

In non-Hermitian systems, spectral degeneracies can arise that can cause unusual, counter-intuitive effects; here exciton-polaritons—hybrid light–matter particles—within a semiconductor microcavity are found to display non-trivial topological modal structure exclusive to such systems. Non-Hermitian dynamics in a quantum chaotic exciton-polariton system In non-Hermitian systems, which are open and subject to gain and loss, exceptional points can arise, spectral degeneracies that can cause unusual, counter-intuitive effects. Recent efforts to observe non-Hermitian physics have concentrated on various optical systems, but not yet on exciton-polaritons. These are hybrid light–matter particles, formed by strongly interacting photons and excitons (electron–hole pairs) in semiconductor microcavities. Such systems require constant pumping of energy and continuously decays releasing coherent radiation, so are a profoundly open quantum system. In a striking experiment involving a chaotic exciton-polariton billiard —a two-dimensional area enclosed by a curved potential barrier — these authors demonstrate this non-Hermitian nature for the first time. The experiment reveals the non-trivial topological modal structure exclusive to non-Hermitian systems. These findings open the way for novel types of operating principles for polariton-based optoelectronic devices. Exciton-polaritons are hybrid light–matter quasiparticles formed by strongly interacting photons and excitons (electron–hole pairs) in semiconductor microcavities 1 , 2 , 3 . They have emerged as a robust solid-state platform for next-generation optoelectronic applications as well as for fundamental studies of quantum many-body physics. Importantly, exciton-polaritons are a profoundly open (that is, non-Hermitian 4 , 5 ) quantum system, which requires constant pumping of energy and continuously decays, releasing coherent radiation 6 . Thus, the exciton-polaritons always exist in a balanced potential landscape of gain and loss. However, the inherent non-Hermitian nature of this potential has so far been largely ignored in exciton-polariton physics. Here we demonstrate that non-Hermiticity dramatically modifies the structure of modes and spectral degeneracies in exciton-polariton systems, and, therefore, will affect their quantum transport, localization and dynamical properties 7 , 8 , 9 . Using a spatially structured optical pump 10 , 11 , 12 , we create a chaotic exciton-polariton billiard—a two-dimensional area enclosed by a curved potential barrier. Eigenmodes of this billiard exhibit multiple non-Hermitian spectral degeneracies, known as exceptional points 13 , 14 . Such points can cause remarkable wave phenomena, such as unidirectional transport 15 , anomalous lasing/absorption 16 , 17 and chiral modes 18 . By varying parameters of the billiard, we observe crossing and anti-crossing of energy levels and reveal the non-trivial topological modal structure exclusive to non-Hermitian systems 9 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 . We also observe mode switching and a topological Berry phase for a parameter loop encircling the exceptional point 23 , 24 . Our findings pave the way to studies of non-Hermitian quantum dynamics of exciton-polaritons, which may uncover novel operating principles for polariton-based devices.

New parents' Facebook use was examined from a social capital perspective. Surveys regarding Facebook use and parenting satisfaction, parenting self-efficacy, and parenting stress were completed by 154 mothers and 150 fathers as part of a larger study of dual-earner, Midwestern U.S. couples making the transition to parenthood. Results indicated that mothers used Facebook more than fathers, and that mothers perceived an increase in use over the transition. When more of mothers' Facebook friends were family members or relatives, and when fathers reported connecting with more of their Facebook friends outside of Facebook, they reported better parental adjustment. For mothers, however, more frequent visits to Facebook accounts and more frequent content management were each associated with higher levels of parenting stress.

Using data from six waves of the Study of Marital Instability over the Life Course (N = 1,998), we conducted a latent class analysis to test for distinct marital happiness trajectories. We found three distinct marital happiness trajectories: low, middle, and high happiness. Initial levels of life happiness were strongly associated with membership in the marital happiness trajectories and with various demographic and attitude-related control variables. Using fixed effects regression with time-varying covariates, we also found that marital happiness trajectory membership was associated with subsequent changes in both life happiness and depressive symptoms. All respondents experienced a decrease in life happiness between Wave 1 and the end of their observed time in their marriage, but respondents in the high marital happiness trajectory experienced the smallest decline. Respondents in both the high and middle marital happiness trajectories also experienced a decline in depressive symptoms across time. Intervention and policy implications are discussed.

The consequences of divorce are pronounced for parents of young children, and cohabitation dissolution is increasing in this population and has important implications. The mental health consequences of union dissolution were examined, by union type and parental gender, using the Fragile Families and Child Wellbeing Study (n = 1,998 for mothers and 1,764 for fathers). Overall, cohabitation and marital dissolution were both associated with increased maternal and paternal depressive symptoms, though for married mothers, depressive symptoms returned to predissolution levels with time. Difference-in-difference estimates indicated no differences in the magnitude of the increase in depressive symptoms by type of dissolution, though pooled difference models suggested that married fathers increased in depressive symptoms more than cohabiting fathers. Potential time-variant mediators did not account for these associations, though greater family chaos was associated with increased maternal depressive symptoms, and decreased social support and father — child contact were associated with increased paternal depressive symptoms.