I was going through this Wikipedia page and came across the following section:
Isaac Newton remarked in a letter to his rival Robert Hooke dated 5 February 1676 [O.S.] (15 February 1676 [N.S.]) that:
What Des-Cartes [sic] did was a good step. You have added many several ways, & especially in taking the colours of thin plates into philosophical consideration. If I have seen further it is by standing on the shoulders [sic] of Giants.
The [sic] in the last sentence confused me, what is the error in Newton's quote? I'm guessing Newton intended that giants have two shoulders, and that he was presumably standing with one foot on each shoulder, so it makes sense to use the plural "shoulders". I am not sure why "Giant" is capitalized, but I don't think that is the error due to the placement of the [sic].