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.
Major League Baseball average game times are down almost 8 1/2 minutes from 2014, thanks to the leagueâs new pace-of-game rules. Thatâs good news not just for fans, but players as well; ESPN reports that MLB officials and the players union are in discussions to drop the fines for slow play the league could impose beginning Friday.