One of the things I love about Google is that they aren’t afraid to try something. They almost always have some cool new feature coming out of their labs. One of the latest is Mail Goggles. Named after Beer Goggles, Mail Goggles is a feature in GMail that requires you to perform a series of simple math problems before sending an email.
In the default setting, the feature is enabled only on Friday and Saturday nights between the hours of 10 pm and 4 am. The idea is that you may not be in the best frame of mind if you are sending emails at that time of night. On the other hand, Google figures that if you have the thinking skills to solve a few math problems, you can probably decide for yourself whether to send the email.
You can activate Mail Goggles from selecting Setting > Labs from you Gmail screen. Best of all, there are a bunch of additional lab feature that you can choose from in that same tab. Take a stroll through these features and see which you would like to enable in your Gmail account.