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Henry Beam Piper was an American science fiction author. He wrote many short stories and several novels. He is best known for his extensive Terro-Human Future History series of stories and a shorter series of "Paratime" alternate history tales.

He wrote under the name H. Beam Piper. Another source gives his name as "Horace Beam Piper" and a different date of death.

The Terro-Human Future History is Piper’s detailed account of the next 6000 years of human history. 1942, the year the first fission reactor was constructed, is defined as the year 1 A.E. (Atomic Era). In 1973, a nuclear war devastates the planet, eventually laying the groundwork for the emergence of a Terran Federation, once humanity goes into space and develops antigravity technology.

The story “The Edge of the Knife” (collected in Empire) occurs slightly before the war, and involves a man who sees flashes of the future. It links many key elements of Piper’s series.