He added that the midwife concerned could not know for certain who she had visited without the diaries.
Walgreen may not know for certain which plans are steering big orders to mail vendors, but says it will find out using internal sleuthing.
While he conceded that the public could not know for certain whether the secrecy is due to phone intercept evidence, Mr Ryder called for an "urgent review" into the provision which prevents disclosure and discussion of telephone intercept evidence which he said was "exceptional".
The paper demonstrated the hypothesis through a complicated experiment in which college students were asked to make a judgment about something they could not know for certain -- guessing someone's weight in a photo -- before having their moods swayed either positively, negatively or neutrally by snippets from films intended to provoke either anger, euphoria or no strong feelings.
The scientists do not yet know for certain how the gene works.
But he warned that the industry does not yet know for certain the length of sewers being taken on or what condition they are in, so estimating costs is difficult.
We cannot know for certain because the administration will not discuss the specific cases, citing the need for secrecy in fighting terrorists.
"I know one thing: that the Iranian leadership has not gone beyond a certain line for the time being of developing the nuclear program, " he said.
CNN: Former Israeli PM calls for U.S. to lead any Iran strike
No one can say for certain how this change will end, but I do know that change is not something that we should fear.
We turn out to know a lot, for instance, about certain species of dinosaurs, he points out, not be cause they are the most important or exceptional, but because their fossils have been easy to collect.
FORBES: The Knowledge Revolution Is Not About Big Data, It's About Well-Connected Little Data
Some patients may not want to know and may be distressed to find out if they have genes that put them at higher risk for certain diseases.
应用推荐