There's hardly a person in the world who hasn't been the victim of manipulation at least once. No matter how smart and educated we consider ourselves, everyone can recall more than once, twice, or even ten times falling for the wiles of a con artist, for example, in the guise of a gypsy or a psychic, an advertisement, or political propaganda. It's good if we can simply forget the unpleasant episode, but sometimes it has a serious impact on our lives.
Let me give you an example. Two friends who once studied together at a prestigious Moscow university, then worked at the same company, shared family ties—modern people, IT professionals, mathematically inclined, skeptical, and ironic—suddenly became enemies overnight. Almost every conversation now ended in mutual attacks, insults, and shouting. Eventually, they stopped communicating altogether. It all started when one of them worked for six months at the company's Kyiv branch, watching TV and listening to the radio there, while the other remained in Moscow and received information from Russian sources. When they met, each was convinced the other had been brainwashed. And both were right.