zombie_utility::set_zombie_var( "zombie_health_increase", 			100,	false,	column );	//	cumulatively add this to the zombies' starting health each round (up to round 10)
zombie_utility::set_zombie_var( "zombie_health_increase_multiplier",0.1, 	true,	column );	//	after round 10 multiply the zombies' starting health by this amount
zombie_utility::set_zombie_var( "zombie_health_start", 				150,	false,	column );	//	starting health of a zombie at round 1