Already Mathematica didn't have Run Buttons
in their Notebooks in 1988, just press return:
https://www.wolfram.com/notebooks/index.php.de?source=footer
Same for creating new cells, if I am not mistaken
and remember well, if one was at the end of a Notebook,
again the return key creates a new cell. Also no
Python Jupyter Nonsense, primarily executed at the
client side and not create via server roundtips.
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