Einstein's second mistake.

Physics for Christmas. Einstein's mistakes. Physics problems today. Two book series.
The expression, " motion with infinitely great speed" is incorrect. There is a phenomenon that modern science calls this, but it is not speed. The essence of this phenomenon is simultaneous mutual action between whole things. In Slavic Bulgarian, in Cyrillic, it is written as follows: ВЗАИМНОДЕЙСТВИЕ
This is one word, and it is different from the Bulgarian word .ВЗАИМОДЕЙСТВИЕ
I suggest, in English writing, to use the word MUTUALISACTION