Sentence examples for it is unknown why from inspiring English sources
It is unknown why the disease develops in any of these forms.
It is unknown why bats are killed at turbines because they are so difficult to observe during migration.
It is unknown why Plans 106 110 only contain two rows of squares, instead of the usual three.
It is unknown why they have surfaced now – but they coincide with tweets from Isis-linked social media accounts that claim to show "new graduates of Jihad School".
Prematurity cuts across all socioeconomic and cultural groups, but it is unknown why African-American women deliver prematurely more than any other ethnic group.
For instance, it is unknown why smallpox only infects humans.
The mutations result in rod photoreceptor cell death, but it is unknown why cones die.
While it is unknown why so few of the amputations performed on this cohort used the Ertl technique, it may call into question the significance of the debate between proponents of the Ertl and non-Ertl transtibial amputations.
It is unknown why some people develop this type.
It is unknown why some people bruise from acupuncture.
It is unknown why such an office was called into being.
