1.  But even as her heart, for no known reason, gave a ridiculous flutter, he saw her and came over.

2.  But he also had some not-so well known reasons to produce a monster effort against the Nuggets.

3.  There are no known biological reasons why minorities might have different cancer rates from whites, which leaves experts looking to socioeconomic and behavioral explanations.

4.  There was no known reason why his game never materialized.

5.  This is a surprisingly low number for which there is no known reason.