Now scientists at Duke University are challenging this idea.

But recently scientists and scholars have challenged the legitimacy of this journalistic core value.

But several civil libertarians, scientists, public health officials and emergency response experts challenged the Pentagon's position.

But other scientists challenged Dr. Stein's findings, reported in the current issue of the journal Science.

A lone Italian scientist has challenged the system by refusing to send her own data to the password-protected archive.

But many scientists challenge that theory.

That we need them from a bottle is what scientists would challenge.

On one side of the argument, some scientists are challenging what they consider an exaggeration of the risks of asbestos.

Each scientist challenges him or herself at a personal level.

The scientists at the institute furthered Sigmund Freud's work but also challenged many of his ideas.