Scientific American

Volume 295 Number 3

departments

8 SA Perspectives

Cooling our heels.

10 How to Contact Us

10 On the Web

12 Letters

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.

Working Knowledge

A tall task for water towers.

Reviews

The Trouble with Physics and Not Even Wrong argue that it is time for string theory to give way.

columns

40 Skeptic BY MICHAEL SHERMER

Economists have a shoot-out over the meaning of "replicate."

42 Sustainable Developments

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Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

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.

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