Damn, I missed this post. Right.
Albert Einstein was a notoriously poor speller and actually failed some tests.
In 1895, he sat the entrance examinations to get into the prestigious Federal Polytechnic School (or Academy) in Zurich, Switzerland. He was 16, two years younger than his fellow applicants. He did outstandingly well in physics and mathematics, but failed the non-science subjects, doing especially badly in French - so he was not accepted.
He worked as a clerk in the patent office.
Michael Faraday was a bad speller too.
Although Faraday received little formal education, he was one of the most influential scientists in history. It was by his research on the
magnetic field around a
conductor carrying a
direct current that Faraday established the basis for the concept of the
electromagnetic field in physics.
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Moreover, considering that "Mc", an Irish term meaning "son of"
McCain means son of Cain. So Mc Cain doesn't really matter and is only incorrect in that McCain is a proper name.
If you wrote sonofcaine it would be grammatically incorrect. Mc Cain works for me.....