A great deal is already known about these domains, but there remain some fascinating, unsolved problems.

"The growth that has taken place has also introduced fascinating problems."

To her it was a fascinating problem in observation.

At that point, he said, these matters will no longer be fascinating academic problems, but his own.

On the contrary, he had found it a fascinating problem.

"But as people got into it, they got excited by working on the fascinating problems in services."

This is a much more fascinating problem than your other injuries.

Death held the answer to so many fascinating problems.

It's no dog, though it is a fascinating problem.

His mind, however, was too fully occupied with fascinating scientific problems.