@Grammar Geek: So we can use "to be interested to" with "see", "hear", "know" but not "learn"? I think "I am interested to learn French" means I find learning French interesting, while "I am interested in learning French" means I want to learn French.
Oh dear. I didn't even notice that the second one was "interesting" instead of "interested." I'm sorry I missed that and thereby created a confusing response!