Parsing Science Newsletter The unpublished stories behind the world's most compelling science, as told by the researchers themselves.

Global decline of homicide – Mateus Rennó Santos

The global decline of births between 1990 and 2015 has led to a reduction in the proportion of people aged 15-29. So might this explain why the world’s homicide rate has dropped by nearly 20%? In episode 64, we’re joined by Mateus Rennó Santos from the University of South Florida, who talks with us about his research into how an aging population is a driving force behind the decline in homicide that most countries across the globe have enjoyed over the past three decades.

The week's top science news from @ParsingScience ...

Air pollution’s health effects

Fine particulate pollution can make in vitro fertilization less likely to work, cross through the placenta, negatively impact children's memory, and lead to a variety of risks to other diseases among children.

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Artificially intelligent diagnoses

Neural network can evaluate neurological disorders such as stroke, Parkinson disease, or Huntington disease as accurately as human experts.

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DNA transplant

Forensic scientists determine that a recipient of a bone marrow transplant now shares the DNA of his donor.

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Spare the suspensions, spoil the child?

Students in North Carolina who were re-zoned to schools with stricter discipline were 17% more likely to be arrested as adults and 20% more likely to be incarcerated.

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An apple a day?

Health-promoting humor styles positively associated with extraversion, agreeableness, conscientiousness, and openness; health-endangering humor styles positively associated with neuroticism.

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Facially communicated narcissism

Narcissists found to be no better at accurately identifying other narcissists, though they are considerably averse to the faces of other narcissists.

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Early riser, or night owl?

Sleep disorders put some workers out of sync with traditional schedules and are estimated to cost employers $2,000 per employee in lost productivity every year.

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