'Returns the number of questions that have not been answered in the
last 24 hours.'

@classmethod
def recent_unanswered_count(cls, extra_filter=None):

    start = (datetime.now() - timedelta(hours=24))
    qs = cls.objects.filter(num_answers=0, created__gt=start, is_locked=False, is_archived=False, creator__is_active=1)
    if extra_filter:
        qs = qs.filter(extra_filter)
    return qs.count()
