Today's reason I'm an idiot

I spent over an hour trying to find out why a simple little bit of prolog didn't work right on my laptop, while it did on my desktop. Turns out that I cut and pasted from a pdf, so that my quote wasn't really a quote, so my string wasn't really a string, and so on. This did not occur to me. This was a trivial little bit of prolog for a tutorial this afternoon.

OK, take away to computer from me, I've shown I'm not smart enough to use it :)