Stories by Kristin Leutwyler

Researchers have found proteins that play a key role in protecting an embryo from its mother's immune system--and that may one day help treat women who suffer multiple miscarriages.

How can we evaluate what has been accomplished and guess at what's to come?

Scientists have made the clearest image yet of ribosomes, the assembly lines inside cells that crank out all proteins

The first pictures of atomic orbitals are confirming theories and resolving controversies

Lab-bred "Doogie" mice learn faster and remember more than their field-born brethren

A recently unearthed fossil has scientists rethinking early hominoid evolution

A single gene may account for individual sensitivities

Research shows that spatial navigation causes telltale electrical activity in the brain

Nuclear transfer--used to clone Dolly and now owned by Geron--may help scientists develop more potent stem-cell therapies

After 50 years of virtually no progress, researchers are finally getting to the bottom of biological scaling

Animal experiments suggest that bone marrow might be used to rebuild damaged organs

Biologists figure out what accounts for certain side-show frogs

Has an American mathematician solved a centuries-old puzzle about packing spheres?