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The Throg task force struck the Terran survey camp a few minutes after dawn, without warning, and with a deadly precision which argued that the aliens had fully reconnoitered and prepared that attack. Eye-searing lances of energy lashed back and forth across the base with methodical accuracy. And a single cowering witness, flattened on a ledge in the heights above, knew that when the last of those yellow-red bolts fell, nothing human would be left alive down there.

Given: The future is probabilities merging into one certainty. Proposition: Can the probabilities be made improbables so that the certainty becomes impossible?

What was the extraordinary connection between Dr. Livermore's sudden disappearance and the coming of a new satellite to the Earth?

Benson did his best to keep his colony from going native, but what can you do when the Natives have a rare human intelligence and know all about the facts of life?

There had to be a way for Sub-Archivist Clarey to get up in the world--but this way was right out of the tri-di dramas.

There are devices a high-level culture could produce that simply don't belong in the hands of incompetents of lower cultural evolution. The finest, and most civilized of tools can be made a menace.

The extraordinary story of "Paul," who for thirty days was Dictator of the World.

For eighty vertical miles Carpenter and Bond blasted their way--only to be trapped by the extraordinary monsters of the heaviside layer.

Magic--there's no such thing. But the crops were beginning to grow backwards....

Guy Burckhardt woke up screaming out of a dream. It was more real than any dream he had ever had in his life. He could still hear and feel the sharp, ripping-metal explosion, the violent heave that had tossed him furiously out of bed, the searing wave of heat. He sat up convulsively and stared, not believing what he saw, at the quiet room and the bright sunlight coming in the window. He croaked, "Mary?" Pinching yourself is no way to see if you are dreaming.