To summarize, science becomes knowledge by publication of research results. It then may become more general knowledge as writers of textbooks pick and choose what to put in their texts, and as professors and teachers then decide what to stress from those textbooks.
The Hughes H-4 Hercules (also known as the  Spruce Goose ; registration NX37602) is a prototype heavy strategic airlift military transport aircraft designed and built by the Hughes Aircraft Company.oward Hughes was called to testify before the Senate War Investigating Committee in 1947 over the use of government funds for the aircraft. During a Senate hearing on August 6, 1947 (the first of a series of appearances), Hughes said: The Hercules was a monumental undertaking.
Cessna 172 Skyhawk. Trainer / Touring Aircraft. The Cessna 172 Skyhawk is a single engine four-seat light touring aircraft produced by the US-American manufacturer Cessna Aircraft Company, a subsidiary of Textron Aviation. The Cessna 172 was in production by Cessna and Reims (France) between 1956 and 1986.