
Science fiction time travel tale for young adults. A survival story that showcases the palaeological theories of the 1960s. Two teenagers, Bob and Pete, go back through time to the Ice age to rescue Pete's father, who has not returned from a trip in Bob's father's defective time machine.

2 June 1915 – 10 May 1993
Lester del Rey was born Leonard Knapp in Saratoga, Minnesota, the son of poor sharecroppers of partly Spanish ancestry. His mother died shortly after his birth, and he managed to complete high school and two years at George Washington University before dropping out for economic reasons. He started publishing stories in pulp magazines in the late 1930s. He was closely associated Astounding Science Fiction, then the leading science fiction magazine. In 1935, his first wife was killed in a car accident. By 1947 he had written enough solid short fiction to generate his first book, the anthology And Some Were Human. In the 1950s, he was a leading science fiction writer. After marrying his se…
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