“The Last Drop” by L. Ron Hubbard and co-authored by L. Sprague de Camp

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Publication date: November 1941

Original publication: Astonishing Stories

Genre: Fantasy

Story description: A special elixir from Borneo that causes people to grow very big or become very small reduces a bartender and a mobster to a combat in miniature.

Currently available as part of the Stories from the Golden Age series, in the title If I Were You.