"We only know the ones who are externally exhibiting symptoms, " says Ms. Sheridan.
We only know so much about the situation in the Congo because the kind of communication that the mobile phone allows.
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We only know they are five skulls and some bones and we also don't know if the bones are monks from the abbey.
And yet "we only know the tip of the iceberg, " says ecologist Benoit Fontaine of the National Museum of Natural History in Paris.
"In the real world there are countless circumstances where we only know a person by their pseudonym or by their public identity, " he said.
Normally, we only know what things are worth by observation.
Arguably, without those concerts, the Southern Christian Leadership Conference would not have had the money to fight white supremacy, but we only know her as mother, wife and friend.
"We don't know who they were, we only know they were from St Austell and they called themselves a 'fast response unit' but they weren't employed by the council, " he said.
Now, anything else at this point is pure speculation, since we only know about Samsung's HSA membership from the appearance of its logo on a relevant slide at AMD's keynote speech at IFA, and there's no official word on Samsung's intentions.
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We really only know what we can remember at any given moment.
"We hope it is nothing worse than that and there is no break or ligament damage but we will only know when we get the results back from the hospital, " said the former Burnley manager.
For that lesson, we need only know one thing: the train is already pulling out of the station.
We will only know in historical context.
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It is too early to say whether Mr Sarkozy is a failure at home: thanks to his doublespeak on so many issues, we will only know on his last day in office whether he was a reformer using populism to change France, or just another French ruler in hock to the country's vested corporatist interests, and paralysed by fear of public opinion.
If we invest only in what we know we become horrifically non-diversified.
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The same goes for the folks around us, whom we do not know, and whom we resemble only in our private desire to know more of what will unfold in public, on the stage or screen.
We'll only know about environmental opposition once new plants are able to clear the economic hurdle.
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Secular Humanism is not even good science fiction because as we all know only the Scientologists have that.
Typically, in medicine, we know only what works for the majority of patients, not what will work for an individual.
But we'll only know if CETP works, he says, if Merck, Roche or another company conducts further studies on a different drug.
"We know only too well that we are once again in another competitive group, " said the Wales and British and Irish Lions lock.
We know only by the data meticulously collected by the Centers for Disease Control and Protection since AIDS was first recognized in 1981.
We know only too well that we need to add to the first-team squad but at this moment in time there is a limited amount we can do until the takeover is completed.
We want and need to have economic growth as that is the only way we know of to reduce population growth (quite apart from the fact that we also need it to abolish human poverty, something of a desirable goal).
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But we still do not know, we can only hope, that those new things would justify the costs of building such systems.
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