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).
BBC Sport - Wimbledon: Sam Groth hits fastest serve of 2015. Groth hits fastest serve of 2015. Sam Groth moves into Wimbledon's history books with the tournament's second-fastest serve ever at 147mph, and the fastest serve of the year so far. The big Australian smashed the serve in the first set of his match against Roger Federer and now only lies behind Taylor Dent, whose 148mph serve in 2010 remains the tournament record.