Nature highlights

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

• Atmospheric CO₂: Leafing through 300 Myr
• Remembrance of things past: A key kinase
• Superfluidity: The Josephson effect in helium-4
• Climate: Follow the Sun
• Hard times: Artificial diamond
• Symbiosis: M�nage � trois
• Neurotransmitters: Glial receptor
• Speciation: On the wing

17 May 2001 table of contents