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This week's research roundup looks at a new $5.5 million ÍÃ×ÓÏÈÉú´«Ã½ÎÄ»¯×÷Æ· study on the impact of marijuana legalization; a groundbreaking female solar observer being brought to light with new research; the de-policing efforts in Ferguson, Missouri; and a rash of earthquakes in Colorado and New Mexico thought to be caused by wastewater disposal.

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$5.5 million study to probe impact of marijuana legalization on use, behavior, mental health

Researchers are studying 5,000 twins to paint a more accurate picture of how marijuana use changes as a result of legalization and how those changes may impact health in the long run.

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New study highlights 'hidden figure' of sun-watchers

Few have heard of Hisako Koyama, but her work places her among the top solar observers of the past four centuries, alongside names like Galileo, according to new research.

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Post-Ferguson 'de-policing' more pronounced in nonwhite areas, study finds

While traffic stops and arrests have fallen in nonwhite areas of Ferguson, Missouri, crime rates remain steady, suggesting cops previously had been "over-policing" these areas.

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Raton Basin earthquakes linked to oil and gas fluid injections

A rash of earthquakes in Colorado and New Mexico between 2008 and 2010 was likely due to fluids pumped deep underground during oil and gas wastewater disposal, says a new study.

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