Exact(24)
Analysis of that dust has left scientists puzzled.
The trigger for these massive avalanches, which occurred on relatively gentle slopes, has left scientists baffled.
These discoveries left scientists wondering just how much noncoding RNA our cells make.
This has left scientists struggling to pinpoint exactly what about the rich world is making people sick.
That detail and the impact results left scientists puzzling over the nature of the objects that had annihilated in Jupiter's clouds.
For the near future, it is an open question whether Mr. Bush has left scientists enough flexibility to advance the field.
Similar(36)
That leaves scientists with a puzzle.
Last summer, one of the two events occurred, but not the other, leaving scientists perplexed.
That leaves scientists with neural stem cells -- a source of which is human embryos.
And the approach for each individual often has several components, leaving scientists to ask which made a difference.
But these failed to materialise, leaving scientists with only one real candidate: Wimps, or weakly interacting massive particles.
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