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.
Some Funny Google Tricks - except that space, gravity, sphere, and binary don't do anything. and the Mordor trick has been fixed so it no longer works.
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