The early development of the flower of Arabidopsis thaliana is described from initiation until the opening of the bud. The morphogenesis, growth rate, and surface structure of floral organs were recorded in detail using scanning electron microscopy. Flower development has been divided into 12 stages using a series of landmark events. Stage 1 begins with the initiation of a floral buttress on th...

Sleep is increasingly recognized as a key process in neurodevelopment. Animal data show that sleep is essential for the maturation of fundamental brain functions, and growing epidemiological findings indicate that children with early sleep disturbance suffer from later cognitive, attentional, and psychosocial problems. Still, major gaps exist in understanding processes underlying links between ...

This paper explores the role of geography in economic development and demographic transition. It presents a growth model where survival is endogenously determined and where the odds of survival and the returns to labor are higher in geographically favorable regions. Higher life expectancy prompts parents to devote more of their resources to old-age consumpion and enjoyment. Consequently, they i...

Years before they set foot in school, children in poor families differ dramatically from children in richer families in their cognitive and noncognitive abilities. The differences have powerful and enduring consequences for individuals’ health, well-being, education, and longevity, as well as for the societies in which children grow into adulthood. What is the source of these consequential diff...

This article gives a glimpse of the early development of automatic control in Sweden covering the period up to the mid 1960s. Much of the early developments took place in industry and the defense establishments. Process control, particularly in the pulp and paper industry, power systems, and military projects were strong drivers for the technology. The article ends with the emergence of control...

Commentary on: Poor airway function in early infancy and lung function by age 22 years: a non-selective longitudinal cohort study. Stern and co-authors, in this issue of the Lancet

Graphene has recently emerged as a material likely to complement or eventually succeed silicon in electronics. From 2001 to 2004, groundbreaking research was pursued behind the scenes at Georgia Tech; various directions were explored, including exfoliation techniques and CVD growth, but epitaxial graphene on silicon carbide emerged as the most viable route. This document provides archival infor...