Say their names: Resurgence in the collective attention toward Black victims of fatal police violence following the death of George Floyd.

The murder of George Floyd by police in May 2020 sparked international protests and brought unparalleled levels of attention to the Black Lives Matter movement. As we show, his death set record levels of activity and amplification on Twitter, prompted the saddest day in the platform's history, and caused his name to appear among the ten most frequently used phrases in a day, where he is the only individual to have ever received that level of attention who was not known to the public earlier that same week. Importantly, we find that the Black Lives Matter movement's rhetorical strategy to connect and repeat the names of past Black victims of police violence-foregrounding racial injustice as an ongoing pattern rather than a singular event-was exceptionally effective following George Floyd's death: attention given to him extended to over 185 prior Black victims, more than other past moments in the movement's history.

Contrasting social and non-social sources of predictability in human mobility.

Social structures influence human behavior, including their movement patterns. Indeed, latent information about an individual's movement can be present in the mobility patterns of both acquaintances and strangers. We develop a "colocation" network to distinguish the mobility patterns of an ego's social ties from those not socially connected to the ego but who arrive at a location at a similar time as the ego.

A clarified typology of core-periphery structure in networks.

Core-periphery structure, the arrangement of a network into a dense core and sparse periphery, is a versatile descriptor of various social, biological, and technological networks. In practice, different core-periphery algorithms are often applied interchangeably despite the fact that they can yield inconsistent descriptions of core-periphery structure. For example, two of the most widely used algorithms, the -cores decomposition and the classic two-block model of Borgatti and Everett, extract fundamentally different structures: The latter partitions a network into a binary hub-and-spoke layout, while the former divides it into a layered hierarchy.

Developmental Continuity and Change in the Cultural Construction of the "Difficult Child": A Study in Six Western Cultures.

This study explores the cultural construction of "difficult" temperament in the first 2 years of life, as well as the logistical and thematic continuity across infancy and childhood in what mothers perceive as difficult. It extends earlier work regarding older children in six cultural sites: Italy, the Netherlands, Poland, Spain, Sweden, and the United States. In order to compare temperament profiles across sites, a "derived etic" version of standard temperament scales is constructed, and then examined in relation to mothers' global ratings of how "difficult" the child is to manage.

Parents' Concepts of the Successful School Child in Seven Western Cultures.

Although children's school success is a parental goal in most cultures, there is wide cultural variation in the qualities that parents most wish their children to develop for that purpose. A questionnaire contained forty-one child qualities was administered to 757 parents in seven cultural communities in Australia, Italy, the Netherlands, Poland, Spain, Sweden, and the United States. Exploratory factor analysis was conducted separately within each sample and results revealed both similarities and differences across the seven samples.