Google's e-mail add-ons are fun

Three of the new additions can keep you from sending an e-mail you regret. The two more practical ones are the "Forgotten Attachment Detector," which scans your e-mail to determine when you probably forgot to include a file, and "Undo Send," which gives you up to a 10-second grace period to cancel a sent e-mail. A third, called "Mail Goggles," tries to prevent poorly conceived late-night e-mails by requiring the sender to solve a few math problems before the message sends.

Other features allow you to use Gmail offline, add a to-do list, show link previews within the body of e-mails and expand the flagging icons beyond the yellow star.

To see these and other options, log into your Gmail account. (You can set up one at gmail.com.) Go to "Settings" at the top right of the page, then choose the link for "Labs." You can also click on the little green test tube next to the settings link. Once you have enabled a feature, you also may be able to tweak it under the "General" settings tab.

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