Tales of the Unexpected #9

Harvey Hacker meets a fellow gambler who has made his own dice from a meteor and with which he cannot lose. Following him, Hacker is able to snatch one when the other gambler crashes his car outside an atomic station. Planning to analyze the cube later, Hacker finds that it is apparently getting larger and larger through the night, nearly crushing him in his own house. But when scientists arrive from the atomic station, Hacker realizes it is he and his house that have been shrinking due to the combination of the radiation and meteor the cube was made of.