To assess age-specific infection fatality rates (IFRs) for COVID-19, we have conducted a systematic review of seroprevalence studies as well as countries with comprehensive tracing programs. Age-specific IFRs were computed using the prevalence data in conjunction with reported fatalities four...

In this paper, we investigate the impact of attending school on body weight and obesity. We use school starting age cutoff dates to compare weight outcomes for similar age children with different years of school exposure. As is the case with academic outcomes, school exposure is related to...

Getting science policy right is a core objective of government that bears on scientific advance, economic growth, health, and longevity. Yet the process of science is changing. As science advances and knowledge accumulates, ensuing generations of innovators spend longer in training and become...

John Ford and Alfred Hitchcock were experimental filmmakers: both believed images were more important to movies than words, and considered movies a form of entertainment. Their styles developed gradually over long careers, and both made the films that are generally considered their greatest...

Recent research has shown that all the arts have had important practitioners of two different types -- conceptual innovators who make their greatest contributions early in their careers, and experimental innovators who produce their greatest work later in their lives. This contradicts a...

Individuals who are likely to realize the largest benefits from improvements in air quality often depend on other members of their households to make time or monetary contributions to their care. The presence of these dependency relationships among household members poses challenges for benefit...

A survey of textbooks reveals that Le Corbusier was the greatest architect of the twentieth century, followed by Frank Lloyd Wright and Ludwig Mies van der Rohe. The same evidence shows that the greatest architects alive today are Frank Gehry and Renzo Piano. Scholars have long been aware of the...

Forty years ago, 96% of six-year-old children were enrolled in first grade or above. As of 2005, the figure was just 84%. The school attendance rate of six-year-olds has not decreased; rather, they are increasingly likely to be enrolled in kindergarten rather than first grade. This paper documents...

We estimate the effects of having more mature peers using data from an experiment where children of the same age were randomly assigned to different kindergarten classrooms. Exploiting this experimental variation in conjunction with variation in expected kindergarten entry age to account for...

Psychologists have not considered wisdom and creativity to be closely associated. This reflects their failure to recognize that creativity is not exclusively the result of bold discoveries by young conceptual innovators. Important advances can equally be made by older, experimental innovators....