Nature highlights

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

• Pattern in the cosmos: Polarization of the cosmic microwave background
• Microbes: SAR11 rules the waves
  
• Neurobiology: Changing your mind
• Photosynthesis: Bright lights
  
• Titan's clouds: Pole position
• Ribozymes: Two only can play
• Brighter LEDs: Quantum dot gain

19/26 December 2002 table of contents