Helmets for protection of the head
-do helmets make people braver, causing more concussions?
-or, are helmets necessary to prevent skull fractures?
-would players be less likely to "spear" opposing players?
-has the helmet become a weapon on the field?
-how many injuries has the helmet prevented?
-are there new ways to improve the helmet?
Really, there are a lot of angles to explore here.