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Cancer Drug Helps Paralyzed Mice Walk

Studies Support an Accelerating Universe

Time Proves Not Reversible at Deepest Level

At Peace with Itself, an Ant Triumphs

Geologists Anticipate an Oil Crisis Soon

Blood, Semen Harbor Distinct HIV Mutations

Big Shocks Push Volcanoes over the Edge

The Leonids Are Coming! The Leonids Are Coming!

Physics

The Puzzle of Flutter and Tumble

Biomedicine

Back Matter