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In two studies, we examined 99 3- to 5-year-old American children's concepts of age, aging, and birthdays. Previous research has shown that preschool-age children understand that all living beings grow, and that growth is a biological process. Humans, however, are distinct from other living things in that we attach great significance to the aging process. Specifically, in Western cultures, we have an annual ritual to celebrate the day we were born—the birthday party. Thus, although the biological mechanism of aging is continuous and invisible, it is marked by discrete yearly celebrations. We examine the proposal that, in part due to its salience as a cultural ritual, children interpret the birthday party as playing a causal role in the aging process. Results indicate that young children understand certain important biological aspects of the aging process but exhibit confusion regarding others, including the causal role of the annual birthday party. [ABSTRACT FROM AUTHOR]

Previous interventions for marijuana use have been administered out of the real-life contexts in which use occurs. In 2010, we interviewed youth aged 15-24 years who use marijuana frequently ( n = 8) and providers who treat them ( n = 6) on the acceptability and utility of a mobile intervention involving momentary self-monitoring of use-related contexts and responsive motivational messaging following clinic-based brief motivational enhancement therapy. Thematic analysis was used to examine youth and provider perspectives on the mobile intervention. Results suggest that mobile technology is a promising tool for brief interventions to reduce youth marijuana use and warrants further development. [ABSTRACT FROM AUTHOR]