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> Any new theory must be compatible with the old one in all these already checked places.

Just like Einstein's theories are compatible with Newton's at much-lower-than-light speeds.

Mercury would like to have a word with you.

In case anyone else, like me, were curious about what is likely being referred to: https://www.forbes.com/sites/startswithabang/2016/05/20/when...

And here, I though you all were talking about the element of mercury, and how its mass is calculated from the 1s orbital using special relativity :)