Theorem identifies cases in which infinite-choice games will have at least one Nash equilibrium.

Intestinal stem cells go awry in elderly flies.

A new device uses an electric field to increase cars’ gas mileage. (p. 9)

New method would make the most of the balance between the good and bad of free radicals, offering a potential treatment for cardiovascular diseases.

Nanoparticles can be designed for targeted delivery of drugs or genes into the body. New work reveals details of how blood proteins respond to these particles.

Draft rules lay out policies for approving altered animals, including those used for food.

It’s not alchemy, but it might sound like it: a new way to transform sugars from plants into gasoline, diesel or even jet fuel by passing the sugars over exotic materials.

A study of 952 children in Manchester, England, suggests that children going to day care starting at age 6 months could be less likely to develop asthma later.

Yeast cells fed a calorie-restricted diet live longer and have just as much energy as those fed a normal diet.

GOTHENBURG, Sweden —Woody Allen might have coined it: the law of conservation of fragility. If part of a biological network gets stronger, some other part is bound to get weaker, new research shows. Its total fragility never gets better or worse, it just stays the same. Rather than being a statement of pessimism, this new law of conservation offers hope for finding better drug targets to treat diseases such as diabetes, heart disease and cancer, according to research presented by Hans V. Westerhoff, systems biologist at the Manchester Centre for Integrative Systems Biol...

As researchers develop ways of reprogramming adult cells, such as skin cells, to have the same flexibility as embryonic stem cells, this new test shows that the reprogrammed stem cells are truly capable of becoming any cell in the body.

Adding carbon compounds to some ocean systems may lead to a counterintuitive drop in their overall carbon content — and how much carbon dioxide the ocean could store.