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The founders of the Solar Impulse Project build on their successes with a planned around-the-world flight and a stopover at the Paris Air Show. By Amy Laboda.

Cure for the common threadache.

Protecting the builder from subsequent owners.

Recently, there has been increasing interest in the efficiency of all vehicles, including airplanes. Designers are seeking to make airplanes that perform better and burn less fuel. Barnaby Wainfan takes a close look at the aerodynamics and mathematics behind this deceptively complex process.