Volume 295 Number 3
8 SA Perspectives
Cooling our heels.
10 How to Contact Us
10 On the Web
16 50, 100 & 150 Years Ago
18 News Scan
■ Ten years later: identifying victims in the former Yugoslavia.
■ Superconducting wires step toward commercialization.
■ New drug factories: chickens and goats.
■ Turbine engine for faster missiles.
■ Surprise: a net warming from contrails.
■ Mentally controlling robots with MRI.
■ By the Numbers: Illiteracy.
■ Data Points: C-sections on the rise.
Forum: Tom Leighton
The Net's real security problem.
A tall task for water towers.
The Trouble with Physics and Not Even Wrong argue that it is time for string theory to give way.
40 Skeptic BY MICHAEL SHERMER
Economists have a shoot-out over the meaning of "replicate."
42 Sustainable Developments
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The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.