Feature

Biology

HIV-like Gene Lies Buried in Human DNA

Who’s Dying for Sex?

Two Approaches Bolster Heart-Bypass Outlook

Scientists Eye Whirlpool in Earth’s Core

Back Matter

Speedy X-Ray Bursts Reveal Atomic Action

Here Come the Leonids

Bad MOODS

Correction: Plastic Plants May Become Plastics Plants

Correction: Archaeology: Well-aged Slabs of Art

Biology