Traditionally made of brown leather, modern footballs are manufactured in a variety of colours and patterns. A regulation football is 28–30 cm (11–12 in) long and 58–62 cm (23–24 in) in circumference at its widest point. It weighs 410–460 g (14–16 oz) and is inflated to 65.7–68.8 kPa (9.5–10.0 psi).
How much does a NFL football weigh? BALL DIMENSIONS
It shall have the form of a prolate spheroid and the size and weight shall be: long axis, 11 to 11 1/4 inches; long circumference, 28 to 28 1/2 inches; short circumference, 21 to 21 1/4 inches; weight, 14 to 15 ounces. Read More...
The NBA will provide each team with 72 official standard game balls at the start of each season. This seems like plenty to me, but if teams need more during the season, they only need request more from the league.
Does the NBA reuse balls? In addition, NBA game balls can be used again, provided they pass the officials' inspection pre-game. Also, if a team needs more basketballs for whatever reason, they just ask the league and they are then sent to the team. Read More...
People quit.
A small percentage - probably less than 25% - make it to blue belt. Of those, less than 10% make it to purple, and on, and on. It's a tough art and most people don't stick around. At the same time it's a highly interpersonal art.
How long does it take to become a purple belt? How long does it take to get a purple belt in BJJ? Read More...
