Best Answer: Today, the national average for the diamonds chosen for engagement rings with regard to carat weight is 0.38 carats. In general, the carat weight averages of engagement ring diamonds are increasing.
Now have you ever wondered what is up with tennis players and the noises they make when hitting the ball back and forth. Well, they have every right to make these noises. Venus Williams served the world's fastest tennis ball among women which was clocked at 56.95 m/s (127.4 mph). That's twice the speed limit on a regular highway in New York City. Tilden holds the title of World's fastest tennis ball served among men with a speed of 73.14 m/s (163.6 mph).
Calories Burned Per Hour. A vigorous game of singles tennis can expect to burn between 528 and 872 calories, depending on your body weight, according to MayoClinic.com. This is comparable to an hour of solid running at 5 miles per hour, or an intense game of basketball. The more you weigh, the more calories you can expect to burn with each hour-long session. Other factors that can affect calorie loss are the size of the tennis court and the type of match you are playing.