It was a top secret Soviet experiment that was definitely not to be sniffed at.
When Mao Zedong visited Joseph Stalin's Russia in the winter of 1949, Soviet spies were reportedly not only monitoring the whereabouts of the Chinese leader - but also the movements of his bowels.
According to a report in a Russian newspaper, special lavatories were installed for Mao's 10-day visit in order for the Chinese leader's stool to be collected in secret boxes instead of the sewers.
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