Asteroid watchers

Article Abstract:

Earth is in constant danger from the impact of asteroids. A small asteroid can cause devastation greater than an atomic blast, and a huge one could kill most of the life on the planet. Although infrequent, the impacts do occur and an early warning system is being proposed.

Observations, Asteroids

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Sons of the patriot

Article Abstract:

The Patriot missile gained an admirable reputation in the Persian Gulf War, but later review has downgraded the missile's effectiveness from an initial estimate of 96%, to 40% in Israel and 70% in Saudi Arabia. The development of five improved missile systems is discussed.

Research, Cover Story, Ballistic missiles

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Slow going for smart homes

Article Abstract:

Several thousand fully automated homes were sold in 1992, a low number considering the extensive public relations campaigns. Smart homes rely on computerized home control systems that allow automatic or remote control of appliances and electronic devices and systems.

Supply and demand, Intelligent buildings, Home control systems

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