Cover of Common Denominator by John D. MacDonald

Common Denominator by John D. MacDonald

A scout group returns with a complete study of a rare, high-potential-danger Class Seven alien civilization, and the alarmists begin to howl.

First published 1951 1950s English First ContactSocial SF

John D. MacDonald's 1951 story frames a thoughtful first-contact tale around the Bureau of Stellar Defense and the panic that grips three worlds at news of contact. Sharp, intelligent social SF from a future master of crime fiction. Read it for a shrewd golden-age story about fear, defense, and what advanced races really have in common with us.

In its time
Published in 1951, during the 1950s, post-war optimism meets cold war anxiety.
Reading it
14 min read (a short story, a single idea, delivered and gone).
Illustrated by
Don Hunter

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