This has to be something that people have studied. Novelty and new challenges are good for your brain. I'm positive that has been researched. As to why learni

This has to be something that people have studied. Novelty and new challenges are good for your brain. I'm positive that has been researched. As to why learning new things makes you a bit grumpy, I'd bet that has been studied too. Probably it's just that feeling of knowing you're not good at it - and maybe envy of those who are.