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This increase in experimentation between 2022 and 2024 follows a particularly sharp decline observed between 2018 and 2022, a period during which social restrictions related to the pandemic profoundly altered adolescents' socialization patterns

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This density parameter also provides insights into a particles shape, whereby a homogeneous, spherical particle has a constant effective density equivalent to its material density and a fractal-like particle, such as soot, has a size-dependent effective density lower than its material density

Reif was also the principal investigator in a larger study published later in the same journal**