How much alcohol should you buy per guest? (Caution: math ahead) To calculate the total number of drinks needed for a party, multiply the number of guests (G) by the number of hours of party time (T).

The National Institutes of Health is offering a solution. It has an online calculator to measure how much alcohol really is in that margarita you may be sipping on.

Health researchers in the United Kingdom have found that drinking two units of alcohol per day reduces the risk of developing gallstones by a third.