Leprosy, a disease that may conjure up images of medieval leprosariums, still infects some 200,000 people a year, mostly in developing nations like India and Brazil, the New York Times reports.

Recent analysis of the bacterium behind the disease, Mycobacterium leprae, indicates that it is "rugged and feeble, exacting and inept," the Times' Natalie Angier says,

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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.