1.   Limiting research to adult stem cells would leave scientists groping in the dark.

2.   That leaves the scientists wondering what exactly they have found and why it keeps changing.

3.   That leaves the scientists wondering exactly what is going on.

4.   These missions took years to get off the ground, and a single failure often left scientists with nothing.

5.   When all the number crunching was done, the scientists were left with two diagrams showing possible relationships between the languages.

6.   But Frady said the line appears to have moved through the wound slightly, leaving scientists to hope that the whale may free itself naturally.

7.   Her head was never found, leaving forensic scientists unable to establish exactly how she died.

8.   The data showed no broad regional trends, leaving scientists scratching their heads as to why some states are more susceptible to asthma than others.

9.   The sheer volume of data has left scientists around the world with a full palette.

10.   The previous docking attempts were conducted automatically by computer and on both occasions the cargo vessel failed to stop near the Mir for docking, leaving scientists baffled.