CURRENT ISSUE HIGHLIGHTS:
The Forgotten Code Cracker
Weirdonomics and Quirkology
ASK THE EXPERTS:
How can graphite and diamond be so different if they are both composed of pure carbon?
SEARCH
Technology
Space & Physics
Health
Mind
Nature
Biology
Archaeology & Paleontology
News
Video
Blog
In Focus
Ask the Experts
Weird Science
Podcasts
Gallery
Recreations
Magazine
SA Digital
Subscribe
Store
Current Issue
Past Issues
Order Issues
Subscribe
Renew
Give a gift
Change Address
Customer Care
About Us
Magazine Content
Feature Articles
Insights
Innovations
Technicalities
Reviews
Staking Claims
Skeptic
Anti Gravity
Sustainable
Developments
Forum
SA Perspectives
Letters
50, 100 & 150
Years Ago
News Scan
By the Numbers
Working Knowledge
Scientific American
Scientific American Digital
Scientific American Mind
October 24, 2007