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ChemistryGene dispensers
A new gene therapy technique releases genetic material from successive nanoscale layers of DNA as sheets of polyester that hold them in place slowly degrade.
By Janet Raloff -
Materials ScienceColor-tunable sunglasses
Engineers have developed sunglasses that can change from dark, filtering hues to clear—and back—at the flip of a switch.
By Janet Raloff -
Health & MedicineNew agent to spy clogged arteries
To improve the detection of harmful arterial plaques, researchers have modeled a nanoparticle on a natural material: good cholesterol.
By Janet Raloff -
ChemistryEnzymes release caged chemicals
A new controlled-release technology relies on enzymes to unshackle a chemical only when and where it's needed.