This Week in Science

In this week's Science, two independent research groups report data showing that RNAi interference is used by mammals to fend off viral pathogens, as well as to control levels of endogenous genes. In one study, investigators looked at undifferentiated mouse embryonic stem cells, which lack an interferon immune response system, and found an accumulation of RNAi molecules after viral challenge.

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NPR reports that Turkish high school students will no longer study evolution.

Researchers report they sequenced and identified plant species in an "al fresco" laboratory.

An Australian team searches for genetic alterations linked to depression in hopes of developing personalized treatments, the Sydney Morning Herald reports.

In PNAS this week: host contributors to typhoid fever risk, effects of obesity-related variants near TMEM18, and more.