And what makes certainty even more elusive is the image, which is anything but a simple photograph.
Their faces appeared to be very similar to those on their official identification cards, though the sight angles were different, making certainty elusive.
There has also been mistrust both between Gulf and Western powers, and between the UAE and Qatar, over support for different rebel groups in Syria, although the covert nature of much of this activity makes certainty elusive.
The institution of private property, meanwhile, made paternal certainty a vital concern, and monogamy, particularly for women, was strictly enforced.
Forecasting what they will be doing a year hence is a game for suckers.But one prediction can be made with certainty.
The C.I.A. spokesman, Bill Harlow, said a technical analysis by the agency had concluded that the voice on the tape was most likely Mr. Hussein's but that the poor quality of the tape made further certainty impossible.
Frequency comparisons between values determined by alternative methods can only be made with certainty if it has been established that they relate to the same modal pattern.
It is difficult to accurately determinate the incidence of adenomyosis since the diagnosis can only be made with certainty by microscopic examination of the uterus.
A good multitasker waits until the first possible moment the decision to do an experiment can be made with certainty, and only then starts to prepare for it.
The studies considered in this review show there is to date no conclusive scientific evidence to suggest a range of RH that is ideal for parchment storage, and an appropriate RH range cannot be made with certainty.
This statement cannot be made with certainty because aquaporin activity and protein expression were not tested here.
