Think big, work small: A new study finds that small teams of researchers do more innovative work than large teams do. The new research, published on Wednesday in the journal Nature, is the latest contribution from an emerging branch of work known as the science of science — the study of how, when and through whom knowledge advances.

Exercise may help to fend off depression: Jogging for 15 minutes a day, or walking or gardening for somewhat longer, could help protect people against developing depression.