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ChemistryNovel material fights against cavities
A new material that dentists might eventually put under fillings and braces secretes calcium and phosphate ions to rebuild teeth as cavities form.
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ChemistryArgon keeps chips and lettuce crisp
A new technique replaces the air in food packages with argon instead of widely used nitrogen, improving taste and shelf life.
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ChemistryTiny spheres may deliver oral insulin
Researchers have developed microscopic spheres that can sneak insulin past the stomach so it can be absorbed in the small intestine.
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Health & MedicineStudy challenges surgery for lung disease
Patients with the most severe emphysema shouldn't undergo major surgery that removes part of their damaged lungs.