Don't worry too much about making a mistake -- though Twitter messages go out instantly, they can easily be deleted and re-posted with a correction. Over the next three pages we'll break down the important elements of a tweet like links and hashtags, explain how to compose a good tweet and list a few tools that can help you become a better tweeter. Basically, tweets are just text. 160 characters, Twitter posts have to fit within the more rigid confines of 140 characters. Certain letters typed into a tweet can change the form of the message. That's easy! If you type in the Twitter handle of another person with an @ symbol in the front of it -- for example, @HowStuffWorks -- that's called a mention. Twitter users can see every tweet they're mentioned in. The mention is a great tool for posting Twitter messages because it adds context to a tweet. Like the SAT, the MCAT is given on a set number of dates throughout the year and you need to reserve a seat ahead of time. There are no walk-in registrations. The AAMC posts an updated calendar of test dates on its Web site. If you're applying to medical school the same year that you're taking the MCAT, the AAMC recommends that you register take the test before September. Taking the test early assures that you'll have enough time to send your scores to medical schools ahead of their application deadlines. If you wait until September and something goes wrong -- you get sick or there's a computer malfunction at the testing facility -- you could miss your only chance to get your scores in on time. If you register on or before the regular deadline (two weeks before the test date), you pay the normal registration fee ($230). But if you wait longer, you pay a late fee ($55) on top of the registration fee. world news

















































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