11.   Acosta said he cannot sleep in the dark now, since darkness was all he knew in the mountains.

12.   But they also said the variations between brightness and darkness might be due to topographic features like basins, or craters formed by impact from foreign bodies.

13.   Darkness was almost complete.

14.   Darkness is his hallmark, and some works are so smudgy that you can barely tell a nude from a landscape.

15.   Darkness is common, but pure silence is difficult.

16.   Darkness is one of the first things most people fear.

17.   Finally, darkness is no indication of UV protection, which is provided by an invisible chemical applied to the lenses.

18.   For Katie, darkness is a friend.

19.   For ogres of all stripes, darkness is the ultimate cosmetic concealer, giving evil a murky glamour and hiding those telltale signs of ordinariness.

20.   For such a sunny place, the darkness is almost visible.