Short story begins with the rescue of one person trying to escape a planet using a solar sail. He describes how his people go through population build-ups and collapses, endlessly.
The finish is always the same, all traces of civilization are destroyed, the last survivors fighting hand-to-hand. Evolution favored those with one arm shaped like a club or axe. This answers the rescuers question about his oddly nonsymmetric arms. They hurry to the planet in the hopes of stopping the cycle. The story was part of a collection in the late 60's, I believe.
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