This article in the Economist reports on research indicating that there may be a genetic basis for optimism. Scientists at the University of Essex in Britain took DNA samples from about 100 people and then tested the subjects by showing them "photographs that may be positive, negative or neutral in tone" and measuring their response. "Sure enough, gene-related variation caused a bias in attention towards positive and negative material," the article says.

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Technology Review reports that researchers in the US have used CRISPR to modify a number of human embryos.

By introducing genes from butterfly peas and Canterbury bells, researchers in Japan have developed a blue chrysanthemum, according to NPR.

Plant researchers plan to sequence some 10,000 samples that represent the major plant clades, ScienceInsider reports.

In Nature this week: a Danish reference genome, and more.