This Week in Science

In Science this week, a team of Australian and New Zealand researchers report data showing that the evolution of flightless birds was not as straightforward as previously thought. It has long been believed that large, flightless ratite birds evolved into various species after the supercontinent Godwana split — a theory that implies that the ostrich and the extinct elephant bird are the oldest ratite lineages.

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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.