I got it. Why, other people might ask, did TEd list the answers by numerals rather than letters as has always been done? The answer is; this is a quiz of math, not of letters. TEd said he will be gone thirteen days, leaving us with thirteen answers to ponder. Coincidence? Sum the numbers 1 through 13, you get 91. divide 91 by thirteen and you get seven. And so the correct answer is seven, (the one about the african antelope).

Need further proof? How many letters are in seven? Five. Answer number five refers to the atom at the middle of the earth. The word sedgwik has seven letters and at the exact middle of the word is the letter G, which is the seventh letter of the alphabet. The seventh position of G is six letters below and six letters above the middle position of Remington's list.
I'm overcome. This is so... so.. eloquent.
The answer is seven.
Milum.