As noted by @jessica in another answer, the quote on the Wikipedia page was edited to change sholders to shoulders (and much was changed to many). Both of those edits were incorrect; what was there before can be seen in Newton's original letter.
The real question is whether [sic], which denotes an error, should appear after sholders. Sholder is a Middle ...
The first [sic] is modern. Rendering his name as "Des Cartes" or "Des-Cartes" was common at the time.
The life of Monsieur Des Cartes containing the history of his
philosophy and works : as also the most remarkable things that befell
him during the whole course of his life / translated from the French
by S.R. (1693).
The fact that an ...
Actually, the second letter does not get capitalized if it's an ordinary word. It would be H-h-hello. As for the word I, since I is a full word, then it would be I--I, with an em-dash between the Is, not two hyphens. The exception is a proper name. H-H-Henry will not be joining us.