Knitting gives me that opportunity. I frogged the socks and am ready to start the pattern again.
The yarn is clearly the main problem, but it's also possible that knitting toe-up and using square needles in that particular size were problems. If I want to really confirm that the problem was with the yarn, I should just switch out the yarn and keep all the other variables the same.
Of course, if it's not just the yarn, I'd need to go back to the original yarn and switch out something else.
Now I remember. The scientific method takes too long and makes you test things you know aren't going to work.
I'm trying again with these variables: new yarn, new shape of needle, new needle size, same pattern, knitting toe-up.
Sorry, Science. Maybe next time.