In: when do high school football players have to commit to a college??

Out: the first Wednesday of February

In: when does the regular season start for the nfl 2017??

Out: September 7, 2017

In: who won the final four basketball tournament last year??

Out: Gonzaga

In: of what mineral are the hard tissues of the teeth and alveolar bone composed??

Out:
calcium hydroxyapatite