New York University's Martin Blaser, among others, is concerned about antibiotics' effects on the human microbiome, reports The New York Times. Blaser notes that when mice are given antibiotics, mimicking what is given to children to treat ear and throat infections — which is also enough to kill the gut bacterium H. pylori — they have an increase in body fat.

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CNN reports that researchers have tied a new variant to opioid addiction risk.

Organoids derived from patients' tumors may help determine what chemotherapy treatment patients would benefit from, according to New Scientist.

An initiative from GenomeAsia 100K hopes to increase the number of South Asians in genetic research, according to NBC News.

In Science this week: genomic analysis of ancient and modern horses indicates population turnover, and more.