Firstly, the researchers dispute amongst themselves over the value of experiments where animals need to be used.

Some historians and researchers dispute that he actually exists.

Increases in birth defects and miscarriage have also been reported, but some researchers dispute those findings.

Other researchers have since disputed the figure, but the study helped focus attention on the intermarriage issue and ways to maintain Jewish identity.

Artifacts from this site are estimated to date from 17,000 to 15,000 years ago, although some researchers dispute their definitive age.

But some researchers have disputed this figure, arguing that the real figure must be higher.

Other researchers dispute her account of events.

In addition, she had come to be viewed by many as mentally unstable, although later researchers have disputed this characterization.

Some other researchers dispute the incompatibility of reduction in vehicle weight and increased fuel economy.

Five decades later, few researchers would dispute that sleep serves some critical - if unknown - biological purpose.