A prefix is a series of letters, or a word, that is added to the  beginning of a word and changes the meaning. For example, in the  word midnight, mid is the prefix.
The more vigorous an activity, however, the more calories youâll burn. Changes in body weight are related to both the duration and intensity of play. Playing singles tennis at average intensity expends 300-600 kcal/h, while high intensity tennis training expends 450-900 kcal/h. Diabetes. The incidence of diabetes worldwide of persons aged 20 or above in 1995 was 4% (approx. 135 million), a figure that will increase to approx. 5.4% (300 million people) by 2025.
On June 24, John Isner and Nicolas Mahut finally finished the longest match in tennis history. Their match lasted three days and over 11 hours. The first four sets looked like any typical tennis match, but the fifth set put this game in the record books. Isner finally beat Mahut 70-68. This match made me think about the longest games in sports history and where Isner vs. Mahut stands in the record books.