Topographic information obtained from the Apollo 15 photographs supports this possibility; however, many puzzles about the rille remain.

There remains a puzzle: what was the purpose of it?

Other puzzles, like Yugoslavia, remain to be solved, and certainly, more, now unforeseen, will emerge.

But a central puzzle remains: who was really responsible for victim's release?

One central puzzle remains: who really was responsible for Farouk's release?

But the puzzle remains: far from departing from 'sound principles' of finance, the frenzy was moving towards them.

The puzzle remains: why would he (or anyone) want to know?

After two months, the jerking movements had subsided, but the puzzle of the baby's muscles remained.

Though the Hussein regime ended with the fall of Baghdad on April 9, many frustrating puzzles remain.

But there does not appear to be a 14-year cycle for spots on Saturn, and many puzzles about the planet remain to be solved.