Experienced pilots are only too aware of the many hazards that can be encountered in the sky. The catalogue of dangers includes flocks of migratory birds, sudden storms, atmospheric turbulence from jets, new high-rise buildings and towers along landing glide paths, instrument-confusing microwave emissions, occasional rocket launches, and the threat of collision with other planes. Now pilots have something utterly unexpected to contend with. In its latest "Notams" (Notices to Airmen), the Federal Aviation Administration has warned aircraft to keep clear of four laser experiment sites: McDonald Observatory, near Fort Davis, Texas:...
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