Doubts have been raised both on ethical and scientific grounds.

Some object to such theories on ethical, religious, political, or scientific grounds.

The key point is that the objections were based on real, scientific grounds.

But they have lost the scientific high ground.

The space station cannot be justified on scientific grounds, he writes.

He defended the need for the shuttle and station on scientific grounds.

The vastly expensive project broke new scientific ground and produced many additional discoveries.

His work was prominent, but none of his studies broke new scientific ground.

We say there need to be scientific grounds for doing so.

Several reviews criticized the film on scientific and political grounds.