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Plants

Botanists refine family tree for flowering plants

Two research teams have used the biggest array of flowering-plant genes yet to try to reconstruct the elusive evolutionary history of today's flowers.

Physics

Sharper than expected

A new technique beats the resolution limits of ordinary microscopes in a way that seems to defy conventional optical theory.

Tech

Tractor beam

Magnetic nanoparticles selectively bind to specific bacteria and can drag them out of a liquid.

Humans

Strategies to improve teaching

Incorporating emerging data on how kids learn and cement ideas could help schools teach science more effectively, a new report argues.