Feature

Front Matter

Back Matter

Geologists Anticipate an Oil Crisis Soon

Time Proves Not Reversible at Deepest Level

Studies Support an Accelerating Universe

Adult Human Brains Add New Cells

Big Shocks Push Volcanoes over the Edge

Physics

Blood, Semen Harbor Distinct HIV Mutations

The Ringing of Gravity Waves

The Puzzle of Flutter and Tumble

Atom Tinkerer’s Paradise