NASA invites space experiments

Have you any space‐flight experiments? The National Aeronautics and Space Administration is seeking proposals for its Lunar Orbiter. Surveyor, Voyager. Orbiting Solar Observatory, Advanced Orbiting Solar Observatory, Tiros, Nimbus, Explorers, and Isis, a joint US—Canadian satellite. Details are in a 107‐page publication. “Opportunities for Participation in Space Flight Investigations,” available for 60 cents from the Superintendent of Documents, US Government Printing Office, Washington, D.C. 20102