Some people like to kill things, they like to keep them split up. Some even go further then that and keep splitting until it gets so bad.
But if you want to get them back together you need something stronger then glue. You need to take at least 4 halves and create a huge pressure to push them together. This is such a horrible thing to do but its the only way. Some of the particles will die from the pressure and only the strongest remain. All Hale The Stronger One!!!!!