Weirdness in HW 15

I corrected a typo in Homework 15 this morning, changing "proton" to →→ "proton 1" and it goofed up the scoring for some reason.

To correct for it, the do-over in tonight's HW 16 is for 8 points, double what it was for HW 15. If I can't get it squared away on HW 15, then do not fret about it. I will adjust the points total at the end of the semester, and even if I were not to do so, 4 points out of a few hundred is not going to change anyone's HW pointage by much if anything.