This Week in Science

The US will no longer be part of an international test of advanced mathematics and physics, reports Science. The National Center for Education Statistics says that it cannot afford the test's cost, but critics say that the Bush administration is pulling out because a bad performance on international tests would reflect badly on the No Child Left Behind Act.

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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.