1 Compact bone: the heaviest, hardest type of bone in the body. 2  Lining cell: flat cells that make up and cover the outer layer of bone. 3  Marrow: a soft tissue found inside bones. 4  Osteoblast: cells make new bone. 5  Osteoclast: cells in your body that break down bone material in order to reshape it.
The changes helped cut the average game length by 12 minutes, from three hours and eight minutes in 2014 to two hours and 56 minutes a year ago - but baseball games were still more than 20 minutes longer than the average NHL game and 40 minutes longer than the average NBA game.
MLB games are 8 minutes less painfully long now. Itâs still early, but MLBâs attempts at speeding up the game appear to be working. According to the league, the average game has already shortened by 8 minutes this year, bringing the 9-inning average game time under the 3-hour mark for the first time since 2011. USA TODAY Sportsâ Scott Boeck found this was true after a few games, and it appears to be holding up a week later.