A. The problem is that researchers don't know the whole truth.

Researchers don't even know whether it works, let alone why.

The researchers do not know how long the entire survey will take.

I suggest that the researchers know what those who pay them want.

Medical researchers have known of the condition for 30 years or more.

The researchers do not know whether the four will develop the disease.

Researchers do not know if bears were more or less common than now.

Researchers do not know yet, but one bit of evidence is striking.

That, he argues, is exactly what researchers still do not know.

Individual researchers know, better than any political entity, the potential of their research.