Gmail feature requires math test
This is an interesting add-on feature for Gmail. It requires you to solve a math equation before you can send an email. I am sure we have all sent an email that we wish we could get back. As a rule, when I write 'difficult' emails, I save them as a draft and review them again in a couple of hours or the next day. I think I have deleted more than I ended up sending.
If you are looking for this feature (and many more), go to Settings and click on the Labs section.
