1. The black boxes could contain the key to unraveling the mystery of what happened to Flight 370.

2. There is a little bit of a mystery to it.

3. This is still a mystery, and is likely to remain so for quite some time.

4. We talk a lot about the journey and the mystery surrounding the destination.

5. The fate of the Malaysian airline remained a mystery nearly a month after it vanished.

6. The mystery lies in exactly what the buildings were once used for.

7. The purpose of the fence also remains a mystery, though the researchers have a few theories.

8. It remains a mystery why some people experience this bleeding while others don't.

9. One great mystery about Titan is how so much methane can be present at its surface.

10. Scientists may have just solved that mystery, or at least part of it.

11. The finding helps solve the mystery of where the oil from the spill landed.

12. My money is on Oracle as the mystery bidder.

13. The secret to solving the mystery may lie more in the western desert itself.

14. It remains a mystery what these embryos would have grown up to become.

15. In addition, a little mystery results in good press.