Wolfram alpha is also fantastic for math. Mailinator is definitely the best throwaway mail account site. You can put any firstname.lastname@example.org, then without even going to the mailinator site, sign up. If you need to verify, you can go to the site.
learning is focusing on something you love and developing a love for that. Learning is finding new things you love and when you realize you don't like something you get that out of your life,, there is learning at school but not all of it is learning.