Lawson criterion for ignition exceeded in an inertial fusion experiment

For more than half a century, researchers around the world have been engaged in attempts to achieve fusion ignition as a proof of principle of various fusion concepts. Following the Lawson criterion, an ignited plasma is one where the fusion heating power is high enough to overcome all the physical processes that cool the fusion plasma, creating a positive thermodynamic feedback loop with rapidly increasing temperature. In inertially confined fusion, ignition is a state where the fusion plasma can begin "burn propagation" into surrounding cold fuel, enabling the possibility of high energy gain. While "scientific breakeven" (i.e., unity target gain) has not yet been achieved (here target gain is 0.72, 1.37 MJ of fusion for 1.92 MJ of laser energy), this Letter reports the first controlled fusion experiment, using laser indirect drive, on the National Ignition Facility to produce capsule gain (here 5.8) and reach ignition by nine different formulations of the Lawson criterion

Contextualising Apartheid at the End of Empire: Repression, ‘Development’ and the Bantustans

This article examines the global dynamics of late colonialism and how these informed South African apartheid. More specifically, it locates the programmes of mass relocation and bantustan ‘self-government’ that characterised apartheid after 1959 in relation to three key dimensions. Firstly, the article explores the global circulation of idioms of ‘development’ and trusteeship in the first half of the twentieth century and its significance in shaping segregationist policy; secondly, it situates bantustan ‘selfgovernment’ in relation to the history of decolonisation and the partitions and federations that emerged as late colonial solutions; and, thirdly, it locates the tightening of rural village planning in the bantustans after 1960 in relation to the elaboration of anti-colonial liberation struggles, repressive southern African settler politics and the Cold War. It argues that, far from developing policies that were at odds with the global ‘wind of change’, South African apartheid during the 1960s and 1970s reflected much that was characteristic about late colonial strategy

A century of trends in adult human height

Being taller is associated with enhanced longevity, and higher education and earnings. We reanalysed 1472 population-based studies, with measurement of height on more than 18.6 million participants to estimate mean height for people born between 1896 and 1996 in 200 countries. The largest gain in adult height over the past century has occurred in South Korean women and Iranian men, who became 20.2 cm (95% credible interval 17.5-22.7) and 16.5 cm (13.3-19.7) taller, respectively. In contrast, there was little change in adult height in some sub-Saharan African countries and in South Asia over the century of analysis. The tallest people over these 100 years are men born in the Netherlands in the last quarter of 20th century, whose average heights surpassed 182.5 cm, and the shortest were women born in Guatemala in 1896 (140.3 cm; 135.8-144.8). The height differential between the tallest and shortest populations was 19-20 cm a century ago, and has remained the same for women and increased for men a century later despite substantial changes in the ranking of countries

Improved parent–child communication following a RCT evaluating a legacy intervention for children with advanced cancer

Although legacy-building is a priority for quality palliative care, research has rarely examined effects of legacy interventions in children, particularly their impact on parent-child communication.We examined the impact of a web-based legacy intervention on parent-child communication. We hypothesized that compared to usual care, legacy-making would improve quality of parent-child communication.Between 2015 and 2018, Facebook advertisements were used to recruit families of children (ages 7-17) with relapsed/refractory cancer. Parent-child dyads were randomly assigned to the intervention or usual care group. The intervention website guided children to create digital storyboards over 2 weeks by directing them to answer legacy questions about themselves and upload photographs, videos, and music. Families received a copy of the child’s final digital story. Children and parents completed the Parent-Adolescent Communication Scale pre- (T1) and post-intervention (T2). Linear regressions tested for differences in change from T1 to T2 between the groups controlling for T1 values using an alpha of p < .05. Intervention effects were measured using Cohen’s d. Ninety-seven parent-child dyads were included for analysis. Changes in parent-child communication were not statistically significantly different between the groups, yet meaningful intervention effects were observed. The strongest effects were observed for improving father-child communication (Cohen’s d = −0.22-0.33). Legacy-making shows promise to facilitate improved parent-child communication, particularly for fathers. Future studies should include fathers and measure expression of feelings and parent-child interaction. Providers should continue to facilitate family communication for children with advanced disease and realize that legacy interventions may impact mother-child versus father-child communication differently