* Study: eating less may delay human aging:
Scientists report the first evidence that a phenomenon long noted in animals may be true of humans also.
* Capsule brings comet dust to Earth:
Astronomers hope the dust will reveal facts about the origin of our Solar System.
* Smoking in pregnancy may deform fingers, toes, researchers find:
The effect, while uncommon, can occur even before a woman knows she's pregnant, doctors say.
* Penguins' wide stride tapped for movement improvement:
The comical waddling motion of penguins may help humans and robots walk better, a researcher says.