Feature

Molecule Building in the Prebiotic Soup

The Many-Mirrored Telescope of the Future

Cat Virus Indicates Cancer Is Contagious

Where Stars Are Born

Books of the Week

Comment: Contemplating the Cosmos

A Strange, Looping, Sideways Lightning Bolt

Front Matter

Natural Sciences

Where Ancient Ocean Floor Meets Young Crust

An Unexplained Flurry of Neutrinos from Space

Scientists Dive to Site of Sea-Floor Spreading