In the December 2009 Issue:

World Changing Ideas
20 innovative ways to build a cleaner, healthier, smarter world

Plus:
• Ancient Greek Computer
Sophisticated Technology Tracked the Heavens
• Arctic Climate Threat
Methane from Thawing Permafrost
• Lessons from the Lost City
What Undersea Vents Reveal about Life's Origins
• Special Photo Essay
Microscopic Life Up Close
• Portrait of a Black Hole

• Featured articles:

• Drowning New Orleans; October 2001; by Mark Fischetti

• The Future of Stem Cells; July 2005; by Clive Cookson, John Rennie, Christine Soares, Richard Gardner, Tim Watson, Patti Waldmeir, Gary Stix

• 15 Answers to Creationist Nonsense; July 2002; by John Rennie

• Misleading Math about the Earth; January 2002; by Stephen Schneider, John P. Holdren, John Bongaarts and Thomas Lovejoy. Introduction by John Rennie