Top news for December 21, 2008

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Watch: How Killer Whales Hunt the Largest Fish in the Sea

Why Mercury Remains a Mystery: Three Key Exploration Challenges

Arctic Coastal Retreat Accelerates: Scientists Sound Alarm on “Triple Threat”

New “Molecular GPS” Allows Immune Cells To Kill Brain Cancer Without Harming Healthy Tissue

Male Cannabis Users Seem to Show Less Cognitive Decline, Study Finds

Scientists Reveal the Hidden Key to More Frequent and Satisfying Female Orgasms

Astronomy & Astrophysics 101: What Is a Light-Year?

Astronaut Armor: Next-Gen AstroRad Vest Shields Against Deadly Solar Radiation

Life Could Exist in Space Even Without Planets, Scientists Say

There's a weird, disappearing dark spot on Saturn's moon Enceladus