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Targeting Hims & Hers, F.D.A. Takes on a New Type of Drug Advertiser

By Christina Jewett, Rebecca Robbins and Dani Blum from NYT Science https://ift.tt/6XNywaF via IFTTT

Rapid fluctuations in oxygen levels coincided with Earth's first mass extinction

Rapid fluctuations in oxygen levels coincided with Earth's first mass extinction
Rapid changes in marine oxygen levels may have played a significant role in driving Earth's first mass extinction, according to a new study led by Florida State University researchers. About 443 million years ago, life on Earth was undergoing the…

Read more at nsf.gov

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