Science: Blips on the Scopes

Air traffic was light at Washington Airport one midnight last week, and the radar scope of the Civil Aeronautics Authority was almost clear. At 12:40 a.m. a group of bright blips showed. The operator estimated that they were about 15 miles southwest of Washington. Then the blips disappeared abruptly and reappeared a few seconds later over northeast Washington. The operator called his boss, Senior Controller Harry Barnes, 39, a graduate of the Buffalo Technical Institute who has worked for the CAA as an electronics expert since 1941. The operator told Barnes: "Here are...

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