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Mount Pinatubo in the Philippines is shown smouldering in late June 1991 in this photograph taken by the U.S. Geological Survey. Although predicting the dispersion of volcanic ash doud and other…

Mount Pinatubo in the Philippines is shown smouldering in late June 1991 in this photograph taken by the U.S. Geological Survey. Although predicting the dispersion of volcanic ash doud and other…

Mount Pinatubo in the Philippines is shown smouldering in late June 1991 in this photograph taken by the U.S. Geological Survey. Although predicting the dispersion of volcanic ash doud and other…

The image illustrates flight tracks in the vicinity of Sydney (Kingsford Smith) Airport, Australia.

The image illustrates flight tracks in the vicinity of Sydney (Kingsford Smith) Airport, Australia.

The image illustrates flight tracks in the vicinity of Sydney (Kingsford Smith) Airport, Australia.

A turn-of-the-century commercial tiltrotor aircraft could extend the useful life of existing airports and preserve service from small airports to congested hubs, according to a recent study. A brief…

A turn-of-the-century commercial tiltrotor aircraft could extend the useful life of existing airports and preserve service from small airports to congested hubs, according to a recent study. A brief…

A turn-of-the-century commercial tiltrotor aircraft could extend the useful life of existing airports and preserve service from small airports to congested hubs, according to a recent study. A brief…

Artist's illustration of a global positioning system (GPS) satellite. The GPS satellite constellation will eventually consist of 21 satellites, plus three spares. A team of engineers from the United…