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Wildfire smoke and combustion byproducts include ultrafine particles in the 0.01 to 0.1 micron range that slip past most consumer HEPA units, and the X5 catches them

Prospective observational (cohort) studies offer less protection from threats to internal validity, but can provide valuable supporting evidence, especially when data from RCTs are limited (as in the current situation) or when randomization is unethical

Ensure that training programs for police officers incorporate obligations on respecting the human rights of all citizens, including vulnerable groups, such as children in low-income communities who may come into regular contact with security forces

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Many are used today to study aspects of our social history such as dress, uniforms etc

After the office fire, he bought a hundred and twenty Gloria-brand fire extinguishers to send out as Christmas gifts