It is not clear whether this is because researchers have looked and failed to find them, or have yet to look.

Other researchers have failed to find any advantage between the two groups.

The researchers fail to mention the social responsibility explanation, however.

Other researchers failed to find the 'less is more' effect.

Experimental researchers in 2001 did indeed fail to successfully use a chocolate teapot they had made.

But other researchers have failed to duplicate the findings.

The researcher also failed to recognize the danger to which he had exposed himself.

Although the link between performance in chess and general intelligence is often assumed, researchers have largely failed to confirm its existence.

The researchers failed to take into account the varying sizes of the pupils and the differing distances between the eyes.

Many early researchers failed to understand these results.