Edna and the crayfish heart in a nature vignette
In a reminiscence for the scrapbook page a reader recalls Edna helping with a crayfish heart discovery in a high school biology class. The note explains crayfish anatomy and compares its relatives, crabs and lobsters, noting freshwater crayfish versus sea crabs and the ability of crabs to leave water. A request offers a free illustrated leaflet on body work via stamped self addressed envelope.
MENTIONED IN THIS ARTICLE
Edna
Fuel Study Links German Air Perf to Low Octane Gasoline
A wartime note suggests German airplanes underperform due to inferior aviation fuel. British analyses of fuel in downed planes show octane levels from 73 to 85, comparable to regular automobile gasoline.
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