At the extreme, many scientists now doubt that there is such a thing as free will.

Most scientists however would doubt whether such efficiencies could ever be achieved.

The scientists involved in the recent research do not doubt that these patients are suffering.

But the star has yet to be located and many scientists doubt that it exists.

Nevertheless, many scientists doubt that vision could have caused the explosion.

The difference being that this scientist still doubts our ability to bring about any such significant changes.

But many scientists doubt this technology will ever be possible.

A few scientists doubt that Archaeopteryx could fly at all.

Most scientists doubt the ability to pinpoint the date of an earthquake.

Some scientists doubt whether the Russians can pull their weight in the joint plan.