Paper airplanes, of course, and paper helicopters that would slowly spiral down and make us question the certainty of gravity.
Suspicious of video technology that, she says, barely allows an operator to tell if a suspect is carrying a rifle or a shovel, she questions the certainty with which many drone operators make life-or-death decisions.
And while one might question the certainty with which a biographer purports to know the workings of her subject's mind (especially when the subject has left behind no diaries and very few letters to document those workings), the outcome of Marie's musings was incontrovertible.
First, reliance upon the precautionary principle might attract the support of people who question the certainty of the science but recognize the large risks associated with global warming.
"Of course, not every author of feminist science fiction was taught how to make a fire in the wilderness by her (or his) parents," Alderman has written, going on to argue that such a training does help you question the certainties of the industrialised world.
Although Weyl came to question the certainties claimed by idealism, he cleaved always to the primacy of intuition he had first learned from Kant, and to its expression by Fichte as the "inner light" of individual consciousness.
Julian Miller, a senior government official who deals with intelligence and security, said at the inquiry that in the preparation of last September's dossier, defense and intelligence officials questioned the level of certainty that should be publicly ascribed to the intelligence material relating to Iraq's unconventional weapons.
And while Mr. Bush and Mr. Blair told the world, mistakenly, that Saddam Hussein had weapons of mass destruction, there is no question that Mr. Assad has them and that his forces have used them, even if Moscow and others question the American certainty on his authorship of the devastating attack last week.
P6, 25 29yo Pakistani agnostic man, post-graduate student, interview Some participants questioned the meaning of and certainty about a diagnosis.
In a novel that takes on the problem of conformity and questions the certainty of narrow-minded ideologues, such circuit-breaking is nonetheless useful, forcing the reader to pause and think in the middle of that dauntless break for the plot's conclusion.
