Nature highlights

Key research and analysis from this week's Nature magazine.

• Not out of Africa: Origins of modern cattle
• Quantum gravity: The reality of space-time foam
• Mantle convection: Sluggish dynamics at depth
• Origins of HIV: Polio vaccine cleared
• Global change: Current concern
• Atmospheric biology: Over the ocean
• Ruffling feathers: Birds and dinosaurs
• Cryptomonads: Cells within cells
• Cancer: A better mouse model

26 April 2001 table of contents