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Millions of years in the distant future, a posthuman scientist is attempting to build a time machine and tests it by sending two boxes with a hastily gathered batch of educational toys into the past. When the boxes fails to return, he believes the entire experiment to be a failure, he discontinues his efforts. One box arrives in the middle of the 20th century and the second in the latter part of the 19th century. Both have had their time-travel circuitry irreparably damaged by the journey.
The exciting first novel in the "Radio Man" series of stories starring Myles Cabot. Read about his advent on the planet Venus, his encounter with the Ant-Men and the Cupians (human-like beings).
Stark terror ruled the Inner-Flight ship on that last Mars-Terra run. For the black-clad Leiters were on the prowl. and the grim red planet was not far behind. First published in 1954.