You've probably noticed: once you learn about something little-known (historical fact, rare name or phenomenon), soon you hear about the same thing from a completely different source. "Well, how can this be a coincidence?" - you think.
This happens not only to you; this is generally a fairly common phenomenon, which is called the "Baader-Meinhof phenomenon."
One day a certain Terry Mullen from Minnesota sent a story to a local newspaper about the first time he heard about the German "Gang of Andreas Baader and Ulrike Meinhof", and on the same day he heard about it again, but from completely different people. The reaction to this article was unexpectedly violent: many people sent in their similar stories, and the phenomenon itself was named Baader-Meinhof.
Scientists are divided on the nature of this phenomenon.
Some explain it by the fact that the human brain pays increased attention to any new information.
Others believe that for the time being we may simply not notice a phenomenon, the meaning of which is not very clear to us, even if it occurs quite often. But as soon as we grasp the meaning, we begin to notice the phenomenon itself.